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For SLI card, which is better, Side fan or Front fan?

post #1 of 11
Thread Starter 
Hello, I'm planning to build a new rig later this year to update my old one.(Waiting for Haswell info and review)
And I plan to SLI my Asus GTX 670 4gb, and is trying to decide on these two case.
They seem pretty similiar, except one has a larger front intake fan, but no side fan, while the other has a side intake fan, but smaller Front intake fan.
So, if I Watercool my CPU with a NZXT Kraken 60, and use 2 GTX 670 4gb with Direct CII, which fan will help with cooling more?

The case I'm looking at are
Fractal Design Define XL R2 (With side intake fan)
http://www.fractal-design.com/?view=product&category=2&prod=111

NZXT H630
http://www.nzxt.com/product/detail/120-H630.html
post #2 of 11
Side fan is much better as it gives direct air to the cards. I have a front and side fan, and the front, though nice, doesn't give much air once it passes through the hard drive rack.
 
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Gsvlip Dudyrm
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post #3 of 11
For cards with open aka non-reference coolers, which circulate air in the case without any direct exhaust, bbelieve that you have to be a bit more creative with the airflow layout.

The goal is to get the coldest possible air to the cards as quickly as possible, and remove the heated air as quickly as possible. The more it lingers, the greater not only your GPU temps, but your case temp in turn heating everything inside.

I would do something like this:
- HIGH STATIC PRESSURE FANS (2mmH2O MIN, with 3mmH2O ideal)
- Have the front as intake
- Remove all unused PCI slot covers and possibly cut out the integrated rear fan grill (replace with a wire grill)
- Mount 1-2 fans internally to the hard drive cages, aligned with the front intake fans, blowing directly across the cards
- Keep any HDDs in whatever mounts put them directly in between the outer front and inner fans' hubs
- Use the top fans as intake to force the hot air from being able to rise to the CPU
- If you have a side fan, make it an exhaust.

This much directional airflow and positive pressurewwill drop case temps and hopefully cause a much more rapid air exchange around the GPU's.
   
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post #4 of 11
Thread Starter 
OK, so side fan is important.

The review for the H630 seems to have a 5 degree difference, although their using Asus 560 TI with DirectCUI
http://www.anandtech.com/show/6951/nzxt-h630-silent-case-review/6
post #5 of 11
also I personally like 140mm fans if I can use them in place of 120mm fans, especially up top.
my case have open ventilation on the side but I do not put fans blowing on my GPU's, I leave them open.
then a fan on the bottom blowing up..

I just SLi'd my 670's and have them in a Corsair 300R case (720°) rig in my sig.
yet to see 73C in gaming hottest card.

enjoy the set-up man. thumb.gif
post #6 of 11
Thread Starter 
Quote:
Originally Posted by malmental View Post

also I personally like 140mm fans if I can use them in place of 120mm fans, especially up top.
my case have open ventilation on the side but I do not put fans blowing on my GPU's, I leave them open.
then a fan on the bottom blowing up..

I just SLi'd my 670's and have them in a Corsair 300R case (720°) rig in my sig.
yet to see 73C in gaming hottest card.

enjoy the set-up man. thumb.gif

Well, I was planning to try out AIO Cooler too, so the top vent will be for the NZXT kraken.
But I'll try out nleksan's suggesstion to see how ti goes.
But I've heard that front, side and bottom should be intake, back and top should be outake.
Will that be the same with a AIO Water cooler?
post #7 of 11
same.

edit:
speaking of intake from bottom and outake at top for air.
subject to change if going with a water setup.
Edited by malmental - 5/18/13 at 3:42am
post #8 of 11
I thought you want to have outside air coming in the rad of and wcing setup be it custom or aio because the air outside is always gonna be cooler than inside the case.
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post #9 of 11
I have experimented heavily with SLI cooling and i found the best result to be a Gentle Typhoon as an intake on the side window. This dropped my temperatures by more than 8c over any other method i have tried.

I tried about 5 different fans (AP-15, BeQuiet! Silent Wings 2, Corsair SP120, Akasa Pirannha, Corsair AF120) and also intake, exhaust, placing a fan at the rear of the cards too.

A single AP-15 @ 1600RPM as intake at the side vs any other fan at any other speed outperformed everything but quite a large margin.

I have Asus cards which dump hot air into the case and since doing this mod, i have never seen my top card go over 68c (i did replace the stock TIM with IC Diamond too)



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post #10 of 11
Quote:
Originally Posted by bluewr View Post

OK, so side fan is important.

The review for the H630 seems to have a 5 degree difference, although their using Asus 560 TI with DirectCUI
http://www.anandtech.com/show/6951/nzxt-h630-silent-case-review/6

imo never even look at temp (or sound) measurements in a case review unless you plan on having the exact same setup as the reviewer, who is usually pretending to be incapable of moving or adding fans. Performance measurements in case reviews are pointless and misleading, imho.
Quote:
Originally Posted by bluewr View Post

They seem pretty similiar, except one has a larger front intake fan, but no side fan, while the other has a side intake fan, but smaller Front intake fan.

A 120mm intake fan is actually a good thing, since smaller fans tend to have a better throw than bigger ones. (not saying it makes one better than the other. Both those cases are pretty nice, actually.)
Edited by Otterclock - 5/18/13 at 6:52am
    
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