Sign in to follow this  
brucewtb

AIO radiator placement

Recommended Posts

Does it matter where you install an AIO radiator - top of case or front? Also what direction for airflow?  I plan to install a Corsair 115i pro into Corsair 750D airflow case.  Thanks.

Bruceb

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

I have just assembled a new P3d rig and eventually elected to put a corsair 105 in the front of a Fractal define S. An extra fan was fitted to the front (total3) aimed at the GTX970. At the top of the rig venting upwards I put one fan linked to the cpu/AIO (cpu fan optional header on Strix Z390 H) and kept the standard case fan. result is that air flow is from front to top back thus getting air over the power circuits.

Pleased with the results so far 25C idle under 70 at 5.0ghz (9700K) in P3Dv4.4 basic install (haven't finished the install yet). All the 5 fans are 120/140 mm and run slow enough to not be too noisy.

Hope this info helps.

Gordon

p.s. I WILL one day find out how to update my sig. with rig details

Share this post


Link to post
Share on other sites

There are videos on this on YouTube by testers I have mine top mounted pulling in with high performance fans front and back blowing across the GPU and MB, but as test have shown the overriding factor is room temps you cannot cool a PC lower than the room air temps.

Corsair recommend pull method pulling air through the rad form the outside room for best performance.

Edited by rjfry

Share this post


Link to post
Share on other sites
11 hours ago, brucewtb said:

Does it matter where you install an AIO radiator - top of case or front? Also what direction for airflow?  I plan to install a Corsair 115i pro into Corsair 750D airflow case.  Thanks.

Bruceb

 

Ingesting air in, through the radiator results in lower CPU temp but potentially higher enclosure temp, thus higher motherboard and graphics card temp. Exhausting air out, so warm enclosure air passing through the rad, results in higher CPU temp but cooler graphics card and motherboard temp. 

Also depends on how you want your enclosure configured, either with positive pressure or negative pressure. Slightly positive is my recommendation, in order to ensure that dust is kept to a minimum. 

As for at the front or on top, there was a very good video a few years back that looked at this question. The conclusion was that at the front blowing in was best for overall cooling. In fact a drop of 10 degrees on CPU temp was observed by positioning the rad at the front of the case, with an open shroud graphics card. Makes sense considering that the rad is ingesting cool air from outside, and that it's not ingesting warm graphics card air from an open shroud graphics card.

So if you have an open shroud graphics card, it may be a good idea to position the rad at the front with cool air being ingested through the rad. 

 

 

 

 

Edited by martin-w

Share this post


Link to post
Share on other sites

I have the same 280 size radiator and 750D case. Just mount it up top. Along with the twin 140mm fans in the front and 120mm on the bottom it will feed enough air through it, you will have NO problems keeping it cool. I have 11 fans in my 750D (including the 3 on the RTX2080) and it makes as much noise as a modern laptop and still keeps everything cool.

My 4790k delidded running at 4.8 in P3d only hits 60c after an hour of flying.

Also I know there expensive but I use the corsair MagLev fans and they have NO vibration at all.

Share this post


Link to post
Share on other sites

Check Gamers nexus test the guy in this video only test two setups and top pushing out not pulling in, pulling in from the top with good rear mounted exhaust fan would have had a different result, if he is right then corsair have got it wrong  and so has gamers nexus and others.

Share this post


Link to post
Share on other sites
3 hours ago, turboken said:

I have the same 280 size radiator and 750D case. Just mount it up top. Along with the twin 140mm fans in the front and 120mm on the bottom it will feed enough air through it, you will have NO problems keeping it cool. I have 11 fans in my 750D (including the 3 on the RTX2080) and it makes as much noise as a modern laptop and still keeps everything cool.

My 4790k delidded running at 4.8 in P3d only hits 60c after an hour of flying.

Also I know there expensive but I use the corsair MagLev fans and they have NO vibration at all.

Thanks but is this the airflow through the top mounted radiator in or out?  

Bruceb

Share this post


Link to post
Share on other sites
3 hours ago, brucewtb said:

Thanks but is this the airflow through the top mounted radiator in or out?

If you have good airflow through the case already (in through the front and out through the rear), having the air flowing into the case through the radiator from outside gives the best CPU cooling.

Share this post


Link to post
Share on other sites
16 hours ago, turboken said:

I have the same 280 size radiator and 750D case. Just mount it up top. Along with the twin 140mm fans in the front and 120mm on the bottom it will feed enough air through it, you will have NO problems keeping it cool.

 

Correct, he will have no problems keeping it cool. But the point is which setup is optimal. 

Share this post


Link to post
Share on other sites
23 hours ago, rjfry said:

.

Corsair recommend pull method pulling air through the rad form the outside room for best performance.

 

Well yes they do, for a reason, it generates the lowest CPU temp. And of course that's what they want us to achieve so that their cooler operates at it's best. Corsair aren't worried about VRM temp, or graphics card temp. 

No rads in my system, but if there were I would seriously consider front mounting and ingesting air in order to keep CPU temps as low as possible. Top and exhausting thus ingesting hot air from the graphics card isn't optimal. 

Edited by martin-w

Share this post


Link to post
Share on other sites
12 hours ago, brucewtb said:

Thanks but is this the airflow through the top mounted radiator in or out?  

Bruceb

 

In, if you want the lowest possible CPU temp, but then all radiator heat is being dumped into the case. It wont be a huge issue though. Thing to consider though is that if you also have fans at the front blowing in, and only one at the rear, it will be a very positive pressure. Not an issue as long as the case has plenty of rear venting. 

Out if you want to keep internal case temp as low as possible, then warmer case air is cooling the rad so CPU temp is higher.... however, it wont make a huge difference to temp. What "out" will do though, when positioned at the top of the case, is ingest hot air from your open shroud graphics card. According to the Bitwit video, as much as 10 degrees CPU temp. In terms of case pressure, the bad side of this arrangement is that you may end up with a negative case pressure and more dust ingress.

Why not try both orientations, top and front and test. Easy enough to switch fans around too. That way you will know for sure. 

No matter what you do it wont be a huge issue, The question is what is optimal. For me, if I had rads to fit, it would be front blowing in, for lowest CPU temp and positive pressure. 

Edited by martin-w

Share this post


Link to post
Share on other sites
19 hours ago, brucewtb said:

Thanks but is this the airflow through the top mounted radiator in or out?  

Bruceb

I have it pulling warm air out through the top as to aid in all the warmer air rising. However Martin is right, it would be more effective to mount it in the front as then you are pulling cooler outside air thru the rad. If your main goal is maximizing cooling for the cpu at some expense of a warmer case. But again with a case this size you will have no problems with heat. Just for a fun experiment I might move my rad up front and see what kind of numbers I get. Then having (3) 140mm fans up top might be very effective anyway.

Share this post


Link to post
Share on other sites

I don't really agree with front-mounted rads unless you have no other option. With just a fan (or fans, but no rad) in the front, you have a source of cooler, ambient temperature air being sucked in and going straight through the case over the internal components exhausting at the back. You can't beat a straight-through path for the air with cables hidden so as not to interfere with the flow. Top-mounting the rad and pulling ambient air through it will add some warm air to the inside of the case but it then mixes with the cool air from the front fan(s). If you had an inlet fan at the top of the case with a front-mounted rad, the cool air entering the case would miss out anything at the front of the case (like drives) and would have to turn through 90 degrees which is not as efficient as a straight-through path.

Share this post


Link to post
Share on other sites
1 hour ago, vortex681 said:

I don't really agree with front-mounted rads unless you have no other option. With just a fan (or fans, but no rad) in the front, you have a source of cooler, ambient temperature air being sucked in and going straight through the case over the internal components exhausting at the back. 

 

True, but in practice its not an issue. The heat from the rad makes very little difference to motherboard temps, or graphics card temp. Countless AIO's and custom loops get on just fine with a rad at the front. With a couple of top mounted fans exhausting, the warm air is quickly vented, along with the heat from the open shroud graphics card. Rear fan assisting too of course. 

 

Quote

Top-mounting the rad and pulling ambient air through it will add some warm air to the inside of the case but it then mixes with the cool air from the front fan(s).

 

It's not an issue, but if someone thinks rad at the front ingesting warmer air is an issue, then configure top mounted fans to ingest air. Then you will end up with exactly the same scenario, namely warmer front rad intake air mixing with cooler air being ingested from the top. The other point in your example, of course, is that with fans at front blowing in, rad fans at top blowing in and just one fan at the rear, you end up with a VERY positive case pressure and if you don't have the rear vents to cope with it turbulence and enclosure temperature rises. Balanced or slightly positive is optimal. 

 

Quote

If you had an inlet fan at the top of the case with a front-mounted rad, the cool air entering the case would miss out anything at the front of the case (like drives) and would have to turn through 90 degrees which is not as efficient as a straight-through path.


I think you are overstating the case. The front mounted fans and rad aren't an issue, as I said, in practice this configuration doesn't at all cause issues with enclosure temperature. Front mounted rads have demonstrated time and time again that the location and orientation isn't an issue and any increase in enclosure temp is marginal, and of course swamped by the ton of heat being emitted from your open shroud graphics card. 

 

Quote

front-mounted rad, the cool air entering the case would miss out anything at the front of the case (like drives)

 

 Most of us have SSD's these days that are mounted in all kinds of locations and don't generally have temp issues.  Mechanical hard drives don't require much cooling. 

 

Jayz2Cents looked at front mounted rads a few years ago... Conclusion: Not an issue. Barely any increse in temp. 

 

 

Edited by martin-w

Share this post


Link to post
Share on other sites

I did a smoke test on mine when built the top mounted rad pulling mounted to left hand side not directly over the MB, the rear corsair HP fan 400-2000rpm rated 140mm the air pulled in never reaches the GPU its pulled out the back, assisted by two front 140MM mounted corsair HP fans blowing pulling in blowing across the GPU and MB, the GPU fans never spin until I am in flight and my front fans stop when my PC is idling and all case fans stop on sleep, the fastest the fans have been 1700  in the sim on heavy scenery with PMDG aircraft they have never gone to full.

The top of my case is open mesh and the downdraft caused by the top mounted rad pulls air down over the VRM again tested with smoke, I have an R5 case with the front door removed as tested by GamersNexus resulting3-5deg cooler in his test using a temp probe 

Share this post


Link to post
Share on other sites
19 hours ago, rjfry said:

 

The top of my case is open mesh and the downdraft caused by the top mounted rad pulls air down over the VRM again tested with smoke, I have an R5 case with the front door removed as tested by GamersNexus resulting3-5deg cooler in his test using a temp probe 

 

That's the configuration JJ from Asus prefers, for the same reason, to aid in cooling the VRM's. 

All this stuff rarely makes a big difference, fans in, fans out, top mounted, front mounted, an extra fan, rarely makes more than 3 or 4 degrees difference. As I've said a number of times, in my opinion most of us over cool our PC's, even those who heavily overclock.

Twin tower, twin fan, air coolers are the same. The extra fan only aiding cooling by two degrees due to slightly higher static pressure. All those coolers out there are running with two fans unnecessarily. In fact I removed one of the fans on the D14 I gave to my son, barely any difference in cooling. 

 

Quote

I did a smoke test on mine 

 

Great trick, incense sticks work great. 😊

 

 

Edited by martin-w

Share this post


Link to post
Share on other sites
22 hours ago, martin-w said:

Barely any increse in temp.

True, but there is still a slight increase. I didn't say that there's anything wrong with front-mounting the rad, just that it's not the best way to do it - even if the margins are tiny.

Share this post


Link to post
Share on other sites
5 hours ago, vortex681 said:

True, but there is still a slight increase. I didn't say that there's anything wrong with front-mounting the rad, just that it's not the best way to do it - even if the margins are tiny.

 

Who's W? 🙂

Share this post


Link to post
Share on other sites

Well so much for trying to mount the rad in the front. NOT gonna happen. Hose is not near long enough for that. Just going to keep it up top.

Share this post


Link to post
Share on other sites
15 hours ago, turboken said:

Well so much for trying to mount the rad in the front. NOT gonna happen. Hose is not near long enough for that. Just going to keep it up top.

 

I recall you have the 750D too... I guess either the 750D is an ultra deep case. Or the AIO tubes are on the small side. 

Share this post


Link to post
Share on other sites

here is my Fractal R6 with top mounted 360 AIO and front 2x140 AIO for GPU

https://www.dropbox.com/s/ns1ugu70p7r5rzi/Fractal R6.png?dl=0

this is an old pic one with a I9 7920X and 1x360 1x280 and 1x140 AIO cooler, now its a 8700k 1x360 on top and 2x140 AIO for the gpus and one intake fan front bottom to mix the hot air from the gpu AIO the cpu runs at 5.5ghz

Edited by westman

Share this post


Link to post
Share on other sites
5 hours ago, martin-w said:

 

I recall you have the 750D too... I guess either the 750D is an ultra deep case. Or the AIO tubes are on the small side. 

That's correct, 750D and maybe both of those statements are true. I do however have the original H110. 4 yrs old now, no problems as of yet. (fingers crossed for no leaks). The newer version I think is H115 may have longer hoses and may reach the front.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this