What Happens If You REVERSE Case Airflow?
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- เผยแพร่เมื่อ 6 ก.ค. 2024
- PC Cases with restrictive front airflow have become a hotly debated issue as form takes priority over function. But what happens when the airflow direction in a computer case is REVERSED by flipping the case fans, does it improve cooling? Let's find out!
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Dmitry doin the hard yards so we don’t have to. Great video man
What happens? I'll tell you. It's the beginning of a chain reaction that ultimately leads to a Category 9 Tornado that sweeps across all of Canada, wiping out all life as we know it !!!!!!!!!!!!!!!!!
Casenado, were rich
the problem with most cases is they are designed for "everyone" with spots to mount 120mm or 140mm fans instead of forcing you to pick one or the other... this causes the re-circulation of air in those front panels because its simply pulling air from the lowest pressure points, which often are those giant gaps designed for flexibility, and you are using preheated air to cool down a system... close of all those gaps so it can only pull in outside air... thats what a "true" positive pressure case is...
people like to throw out phrases like "positive pressure" when describing this, but most folks do it wrong, because their positive pressure cases are just trying to throw more fans at the problem rather than using less the correct way, it needs to be a true one-way flow, without ANY ability to re-circulate from that initial entry point, less is more, as long as less is done right... if you don't do it right, yes you will need front fans, bottom fans, and top fans, and hope you get enough fresh air inside...
if case manufacturers created different mount plates for each fan size, so there were no gaps and it was truly sealed for one-way air flow without any re-circulation, you would see a lot of the poorly tested cases with restrictive front intakes perform slightly better, still not great because its a restrictive entry point, but it would be enough to shave several degrees off... I should also point out this means the fans will generally run more quiet because they are spinning slower because the inside is cooler...
i dont think ive learned more from a youtube comment then i did from this one. thank you.
Corsair 500D has the versetile mounting you discribe but with the air filter flat against the fans and air openings making it actually more restrictive to re-circulate hot system air. I assume most case manefactureres take these things into consideration already and if not black duct tape sometime is the answer.
I make my own case fillers.
If you take a piece of paper and mark it over the whole area you want to cover, then laminate it and cut it out, you can place it around the 120mm fan to block the 140mm gaps.
I've tried a top to side flow system and its rather good. Cut holes in lower part of the side panel for intake and fans on front, back and top draw out.
It's negative pressure, but that doesn't matter as it's negligible and I've sealed any gaps with cheap sealant.
It's a second hand cheap case and I don't care about aesthetics.
I'm using a top down CPU cooler though
I'm sure Electrical tape could also pull this off, and since it's inside it won't be seen
To compliment this I would like to see a return to full frame fans. The round frame fans are leaky as all hell, especially if you slap them on rads.
So what about top exhaust configuration and front and rear intake?
this answers exactly all the 7 questions i had about my build. satisfying.
I'd be curious how these graphs change with a topflow CPU cooler such as the Wraith Prism. There are also simple magnetic dust filters you can buy for cheap to mitigate rear dust intake.
i am so glad to have stumbled across your channel guys! i love everything from the editing to the content, to the humour!! good job y'all.
Welcome :)
-D.
I've wondered about this myself- I wonder if putting jury rigging a small fan on the unused pcie slots will help with the gpu temps.
You can also buy filter mesh separately buy putting sticking it to some magnetic tape that would take care of that issue although the factory look will be gone alibet only from the back.
Damn‘ interesting! very cool idea to proof the difference between the standard fan orientation and the vice-versa-scenario - very well done!
The heatsink that I have currently installed is too close to my ram slots and when I install the CPU fan I can't use the 4 slots so I moved it to the back, it sucks air from the back and pushes it trought the heatsink to the front. I have 3 fans in my case one in the front bottom that pushes cool air into the case, one at the top above the ram slots that sucks hot air and one at the back that also sucks hot air from the case. I was wondering if I could reverse the fan in the back so it pushes cool air directly into my cpu fan, I don't know if it will introduce a lot of dust or if there will be some kind of pressure that will shorten the life of my cpu fan.
Interesting video thank you. I have a Antec Nine Hundred case slightly modded with an extra 3rd front case fan where the blu-ray drives used to sit. I also made the CPU and GPU have their own chambers by sectioning them off so each has their own chamber in the case.
I vented the GPU out the side of the case which worked a lot better than i was expecting because under load there is a lot of warm air coming out of that vent. Since there is a 200mm top case fan which can move a lot of air by itself I reversed the back case fan to blow into the case . So I have the 3 front fans and the back case fan blowing into the case set on medium speed setting. The top 200mm is also set to medium.
My system used to run warmer before doing this but now everything is a lot cooler temps really dropped every where. The only warm spot is the side vent for the graphics card I was even surprised how cool the psu was after this.Under full system load the air coming from it is nice and cool. Idle temps on CPU now sit about 1-2c above room temp load temp hover around 45-64c gaming and this is with a i7 2600K@5.0-5.1GHz on air cooling. Bsfore the changes the same system had my cpu at 56-76c gaming idles were about 6-8c over room temp. I have not done testing like they do here I just monitor the temps sometimes while gaming. I'm sure if I was to run the prime or Aida 64 stress tests my cpu would heat up a lot more,but that brings up a good point if my system never gets hot while I daily drive it and hardcore game on it then why would I give a crap how warm it gets in those programs which are made to juice up your systems and bake them.
For testing if my OC is stable I run CPUZ stress test for about 2 hours as well as cinebench at the same time if it makes it through this stable I know it is going to be game and daily driver stable.
What if you have front mounted aio? I’m curious about having rear, top, and bottom intake. And only front exhaust. I’m guessing it might be better for cpu and gpu as well as dust on aio. I’m using Lian li 205 with 1x rear 120mm 2x top 140mm, 2x bottom 120mm (psu shroud), front 360mm aio and front 2x 180mm fans (works with 360mm aio). ALSO my case is completely open (front panel off, side panels off, no dust filter beside the bottom).
I love how you’re diving deeper into fan configurations! I’ve got a lian-li PC-Q37 mini itx with a total of 6 fans intaking from the bottom and exhausting through a 280mm aio out the top. My CPU suffers, but my strix gtx 1080 stays at 66c OC @2GHz :)
Looking forward to your next vid Dmitri!
Great Video Idea! I Love your blue and purple lighting in the back!
Very cool experiment, reversing the airflow direction was a really great video idea!
I would love to see a test with both front and back intake but all top exauts.
Top exhaust might make 700i result better
Part of the issue is the higher the airflow, the harder it is to see results.
nope. default config is best in a case with such poor top ventilation.
I was just thinking this the other day! Thanks D for experimenting!!!
I have a matx motherboard... Will 2 bottom intake, 2 front intake, 2 top outtake and 1 rear outtake be good?
@HardwareCanucks
Very interesting test, but don't You think that the "raised GPU temp" simply could be down to the fact that there is NO fan "feeding" the GPU at all in that setup. Wereas in the "normal setup" You have the bottom of the two front fans blowing what little air it can "pull in" directly towards the GPU ??
Best regards.
Very interesting video. I love your content! You're so engaging and you editing is so good.
In the case of the kolink wasn't there some negative pressure created when the fans are reversed (1 in 2 out)? Wouldn't that also affect temps?
but what if you have custom loop whit 120mm rad on the back? will it help to reverse fan? i have 240mm rad at the front pulling fresh air in the case.
Congrats to good people for 900K Subs
899K*
Have you tried with a front and rear intake, with only the top exhausting yet?
How about adding 2pcs 120mm fans on top, put it exahust and then make it intake . Then can u also add the vertical gpu orientation with same reverse air intake for a more in dep review about this airflow content.
Will any one advise me the best Z370 for gaming and overclocking motherboard?
Finally someone made a video on this 👌
I'm up for a Kolink Stronghold review. Any chance?
Timothy Ngo Yes pleassse
btw that case look identical to my mAtx build case. Tecware Nexus M. its a nice cheap little case. :)
I have the same exact Be Quiet fans model and I thought I mounted them (back 1x120 + front 1x140) in the wrong direction but I see your normal build is with be quiet logo to the front for intake. I used anti-vibration fittings and I can hear some subtle whistle so I thought it could be some air turbulence. Sorry if I missed something but english is not my main language and this was the first time I replaced fans in my case.
I have this same idea but i also have two top fans, would wonder if i would make them all intake fans, making the front 3 fans to blow all out
This was a great idea Dmitry. Bummer, it wasn't as successful as we were hoping. Thankfully, you were able to get CPU temps down but as was stated the GPU didn't improve. Oh, well! Still a great video idea sir.
I guess I'm too old for this. Around ten years ago,I used to play with various configuration of 80mm case fans. For TLDR people, I found that you can get away without an intake fan with just exhausts at highest possible mounts like the rear and top mounts. If your exhaust is through the small vents, it just returns some hot air back to the case.
intake is in the rear or front? because i have mine on the front
Добрый день Дмитрий! I'm continuously impressed by the production quality of your videos. You maximize the potential of your workspace, and perfecting the lighting and videography is something that you obviously enjoy doing. You're very talented. As a photographer myself, I'm humbled by your passion and attention to detail. С наилучшими пожеланиями.
Can you put 2 200mm fan on top the h500p mesh and tesing air flow
Could you try this with the InWin 301?
I use my front and rear fans as intake and have to fans at the top of my case for exhausting heat (case is p400)
the great thing about having the rear fan as intake is I feel it sends cool are strait over the vrms which help with cooling those off
all of them are pwm and I have the intakes set about 10% higher than the exhaust to create positive pressure and forces more hot air out through the top. to deal with the no dust filter on the rear fan problem I bought a magnetic filter that I just slap on the back of the case, it cant be seen from the sides or front so it takes care of that well enough for me.
What you think about Antec p8.
Is it possible that your gpu will glitch because of the bad fan air flow? my gpu glitch when the vcard heats
And the award for the YT channel continuing to have the best sponsor ads goes to...
As an HVAC tech and someone who has a degree in thermodynamics, this is right up my alley. It all has to do with your GFX card cooling. If you have a blower style cooler do NOT do this as you will be sucking in hot air and that won't cool your CPU as well as you would be sucking in air from the front air. The more air flow and exhaust the better it's going to cool off your card. Reserving your air flow is going to mostly kill off your air intake/exhaust to the card itself which is going to result in higher GPU temps. I would also recomned If you have a CPU like this one in the video I would recommend a blower style as it more heat efficient to direct the heat out of your case.
In my previous build I had an H80 for intake in the back, 2 of 120mm fans for intake at the front and a 200mm for exhaust on the top and my temps were fairly good, I also had a 120mm fan on the side for intake to give fresh air to the graphics card which was an open style gpu
This was perfectly timed!
I recently got a Corsair H100I V2, but by case didn't have enough clearance in the top to mount the rad and fans, so I ended upt mounting them in the front, and like most cases the front is almost completely covered.
Instead of having the fans blow the heat from the rad back in I mounted the rad to the frame and the fans behind it (closest to the board) blowing the air out the front like proposed here.
I reversed the rear fan also, but frankensetined the fan cover from my old PC case's PSU.
I also mounted 2 fans on the top where I wanted the rad to go.
I'm not sure which orientation is best though, pulling air in or out?
I can remove the front cover of the case as its TG with some metal design with cutouts to help if it gets toasty.
I think it depends on the case, I did this reverse orientation in the cooler master haf xb evo and it worked very well
Wouldn't only having one fan for intake reduce supply of fresh air and lead to worst temps as well? Would it have been better to have two intake fans mounted at the top instead of one on the side? then have the CPU cooler mounted so it's blowing down onto the Graphics card been a been a better option? Plus many cases do come with filters for the top so that would also help with dust.
Road to one million subscribers! Let's go!
Yessss! #900K
HardwareCanucks it's so awesome to see you grow from 50k subs to 900k. Keep up the good work!
Jesus! I hadn't noticed how big this channel has grown!
I tested this several years ago when I completed my first build and had no idea which way the fans were supposed to face. The throttled gpu was resolved when I used the gtx 550 ti. No heat buildup at all. No performance either. But no heat.
I also was thinking of this
Can you recommend some cases that do have good front ventilation? My case is ancient yet does have reasonable air-in + dust filters at the front. Seems a shame when aesthetic becomes more important than function. Maybe a round-up video? Budget, mid range & premium?
Linus did an experiment with interesting results.
He made 100% out fans, 100% in fans and standard.
Experiment was related to dust but temp results were also interesting with 100% out having really good result.
It'd be interesting to see what this does to dust accumulation in the long term. I'd be concerned that the rear intake may pull some dust into the rear IO ports.
God demn just what I needed. Thank you very much for this my man. A cape on your back fits you better
In my next build I will have the air going from right to left, pushing cold air directly onto the motherboard and the watercooled CPU. The GPU may get a helpfan blowing out air upwards through the unused extension ports. I'm considering the Termaltake V21 because of the nice magneticmesh dustfilter on the sidepanel and overall modularity.
Would have loved to see the front panel removed results. If you think about it , it the front panel should not be restricting airflow, if it blows in or outwards.
This might be ideal for these cases+a blower style GPU?
There is a possibility my Corsair carbide 600C may benifit better from reversing the cooling since it is a inverse ATX design, so it would not be recirculating the GPU heat back in, and with the Corsair H100i GTX AIO still blowing down the bottom of the case, if I got a stronger rear fan to pull air in from the back, it may actually help the NB temp of my old AM3+ board (I know, in desperate need if internal upgrade, blame DDR4 pricing)
can you test the inwin 301?
You should try a blower style graphics card, it may help exhaust some of the hot air as opposed to recirculating it like the open air card you used.
Is the power supply still blowing out the back bottom, recirculating?
ive been thinking about this a lot lately
i feel like this would be better on a case like the thermaltake view 37 with out a power supply shroud because you can get a fan down below the gpu getting fresh cool air blown into the gpu they way you did it left the gpu fighting for air
I've tried to reverse the airflow on my S340 Elite couple months ago and I can tell you that, if you're watercooling, it changes a lot, as not only I got better temps on CPU and GPU, but also on other components like RAM and the VRM
hey i know its been a year since you commented this but i have the exacts same case and am doing watercooling and want to reverse my fans for aesthetic reasons, how dit you configure everything, and are you using the included fans? thank you
DutchDinosaur I know it’s been a year since you committed but I’m now in a similar situation and want to know how it worked out for you.
@@DutchDinosaur Hi, sorry if I'm replying a year later, anyways, since I commented I changed quite a few things in my pc and I'm not looking to achieve the best performance anymore, I just need a reliable machine for work (which is totally overkill for what I do lol), so I can't really tell you how it worked out as I have a typical airflow config now
@@feelingtech2233 I had been using the referse airflow for a pretty long time, I recently swapped the airflow back to normal and I'm actually getting over 10 degrees cooler on the cpu now. And the rest of my components are still close to the same temps
What if both front and back are intake and top (only) is outtake?
(Or for some cases: Only bottom as intake and top as outtake, no front or back? Hot air goes op, so if you help this process...)
Just built a system define r6. Aio fans pulling in and power supply fan on botton of case front fans pulls in rear exits any concerns with setup 1st build in 15 yrs
how about the ventilation on the top? can we rotate the cpu cooler?
Thank you!
Is NZXT really any good? My bro has a case and fans from them from a few years ago and they are both garbage. I'm wondering if they have improved.
What a lot of people don't understand is AIO coolers. They are designed to push cold air from the outside to the inside of the case letting cold air pass through the radiator rather than hot air inside the case pass through it making a big difference in temperatures. I did this test with an H60 push pull configuration and it was 6c cooler letting the air push in from the outside.
He kinda looks like Chris Pratt.
He kinda does if you stab your eyes out with an icepick.
Using the rear vent for intake is way underrated and underutilized. If you have a blower-style GPU, then it makes sense to avoid intaking warm air from the back of your case. But if you don't, intaking fresh air straight to a CPU air cooler is very effective. But you shouldn't exhaust thru the front, you can intake from the rear and front and exhaust out the top either passively or actively.
What if you use a low profile horizontal cpu cooler so that you have an unblocked air channel? Also, add a fan to intake from the top of the case.
i have a 3060 12gb and my fan is placed the way at 6:08 should i change the positiions ?
my in fan config in the Corsair 900D is 3 Corsair maglev in the front for intake and For exhaust 1 NZXT aer 140mm in the back and the top 4 NZXT aer 120mm before the 480 rad and 4 Vardar behind the rad.
My idea for the rad that the Vardar's will provide the static pressure and the NZXT Aer will look awesome. And all fans are balanced in a way that you will have a natural or positive Pressure inside the case.
Those reserve setup Gpus temps are intriguing indeed.
Dat wallpaper though. Can u give the link for the wallpaper?
How about rear fan in top fan out?
my fan arangement are 2 hd 120's in the front witch can't do anything because they are 2 mm away from the acrylic and the front panel is compleetly closed and then there are 2 120 mm fans in the bottom one blowing in to the plower style cooler of the top card and the other in the open cooler of the bottom one and the cpu has a modified intel stock cooler with an 80 mm fan for exhaust
Nice seing you using more unknown brands! Really think Kolonk are good!
New equipment? Video quality has become amazingly better. And it was not bad before.
So the h700i cpu load temperature is within margin of error making it detrimental in all actuality because of the increased gpu temperature.
Sticking an 80mm fan under the GPU helps a lot. Mine is set to exhaust, giving the you dedicated exhaust fan to pull that hot air out that normally gets trapped between the GPU and PSU shroud. This is in an H500P with the GN front panel mesh mod.
That little 80mm fan removes a ton of hot air. I went with a BeQueit fan, so despite being 80mm it adds no fan noise to the system. Only ever hear my GPU and AiO fans.
I’ve got a Fractal Define 7 Compact, chimney layout (exhaust fans on the top) seems to work best there for me, perhaps also because I’ve got a RTX 3090 FE which pulls air through the card and exhausts it to the top
Currently using a Fractal Design Define C and air flow seems pretty good. Temps are really good in it using the front as intake. Then again I guess Fractal's slits for air flow are bigger than NZXT's. I would've however considered a mesh front case if Fractal had one when I built mine. The meshify C looks great and performs really well in terms of air flow.
Similar case design here.. I did 2x120 intakes, 1 120 in the rear exhausting and 1-120 at the top rear exhausting. Installed the 2x120s inside the front of the case, removed the front panel and taped all the holes and gaps so air wouldn't be pulled from inside the case. My intent was to gain direct fresh air from outside the case only. It helps quite a bit! see the large gap above your front fan? yeah, trying to do intake with limited airflow, it'll pull air from inside the case and throw it back into the case like an eddy. Taping the front of the case all around the fans and any gaps behind the front panel makes a good 3-5* difference. Went from 80* down to 75* while benchmarking. Cheers!
Why not with dark base 900 pro with reverse mainboard where the gpu is on the Top?
Using jonsbo umx4, 1 rear intake, 2 top exhaust, 2 bottom intake. Getting good temp for daily usage.
good timing... I have a Corsair Carbide Air 540 and just put the corsair H150i to exhaust in the front... could only fit one 14cm fan as intake on the top and the back 14cm as intake as well. seems to be working well. My r290 has always been hot idling around 40c but she isn't exceeding 88c during benchmarking and games so i'm happen. Haven't seen my ryzen 2600x exceed 61c yet. Noise isn't bad either.
just bought an NZXT S340 elite midi tower and I'm really happy with it
That kolink stronghold looks alot like my case the Tecware Nexus M. nice vid btw.
why are you not using 140mm fans in your h500p
Do any of the bequiet fans make a coil whine noise I got some and they make a strange hum/whine.
Same here, I wonder why because it's subtle and not constant noise, maybe some turbulence, I should monitor fans speed when idle and under full load.
I love these guys videos.
This is why I always use a top exhaust design. I actually have a Nanoxia Deep Silence 1 box with a Sabretooth 990FX that was running hot and kept shutting off totally on its own. I decided to swap out to another motherbord and processor but in the process I found using smoke that my top exhaust fan was installed backwards and was bringing air in, instead of out. I reversed the fan and this resolved the heat process and now, with the new motherboard and processor the PC is running cool and silent as a tomb. Now, perhaps the new MB and processor produces less heat but I'm convinced the corrected top exhaust has been key.
What if you put a the intake under the GPU, you'd have to jerryrig it. Then have the normal back fan be the exhaust. Wouldn't create a cycle of drawing cool air from the bottom and then pushing out the hot air at the top?
Yep, this was more popular / heard of when huge hard drive cages were welded to the front interior of the case. You couldn't get the front intake fan to push air all the way through the cages up to the CPU cooler. Its smarter to put the CPU cooler fan in a push config on the other side, instead of pull like you have there. This way the air will enter the CPU cooler, warm up and you can exhaust it readily via top exhaust fan. otherwise, the hot air could just linger toward the front of the case. You can even turn around that front original intake fan on the case instead of exhaust to intake, to help push that hot air up to the top and out, where the hot air will naturally want to go anyway. The method overall works real good, you can even get some magnetic dust filters off amazon in 120mm size to cover the new rear intake from dust.
I still use my cooler master storm sniper that has side, bottom and front intake 200mm and top and rear exhaust 200mm and 120mm with standard air cooler 2x 120mm fans but now I might get the rear fan off it and maybe put it at the top of the front panel for more intake and less "static pressure".
But I'm loving the 200mm fans
You should have gone for higher CFM rear intake fan in rear configuration
What is that white LED GPU backplate and where do I buy one??
It's included on the GALAX card by default.
-D.
TLDR: Universe implodes on your case.
I've been thinking about doing this because my 3 front fans has been fighting over the small gap on the bottom front of my pc