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Need fan advice: first build

post #1 of 5
Thread Starter 
Hi all,

I decided to build my own PC for the first time. I settled on the following components:

Case: Fractal Design Core 3000 USB 3.0
Motherboard: ASRock 990FX Extreme3
CPU: AMD FX 8350 Black Edition
CPU-cooler: Gelid Tranquillo Rev.2
GPU: Sapphire HD 7950 Dual-X
PSU: Cooler Master GX Lite 700W

Since I'd like to overclock both my CPU and GPU, I'd like to get the best cooling possible with standard case-fans. Reading through all the different material and advice on the internet, I'm quite torn as to how my fan layout should be. What I've read so far:
  • Keep intake at the front/side/under, exhaust at top/rear.
  • Underpressure provides more reliable cooling.
  • Front roof fan (exhaust) may "short-circuit" the CPU-cooler.

Now, I've tried to follow that advice, but without using a front roof fan and only using the rear/top as exhaust, I can't make a lay-out with underpressure if I use all other fan slots. So my questions are:
  1. Should I use the front roof fan mount? And if so, as intake or exhaust?
  2. Would it be better to remove some intake fans to get underpressure at the expense of smaller air flow?
  3. Are there any lay-out changes advisable? (see picture below)

(my build would be roughly similar to this, same case and CPU-cooler)

Any other advice would be most welcome! smile.gif
post #2 of 5
Welcome to ocn
Personally I think circulation is the key.. So good cable management is essential.
Only issue with underpressure set up is dust...it'll worm it's way onto heatsinks diminishing their cooling ability...
Best advice is to test different configs and note gpu/CPU temps at stock settings at idle and load.
Bear in mind the ambient room temp as well.
For underpressure :
I'd suggest rear,both tops as exhaust, both front and under as intake and side as exhaust...check temps and the try side as intake-you could still maintain underpressure if the cfm of your exhaust fans is higher than the intakes( could user fan controller/voltage reducers-even adding dust filters will reduce airflow-hard drive cages will slow it down too)
The side panel fan will have the most impact on gpu temps.

As to the front top fan short circuiting the CPU cooler, only testing will tell. As long as the front area of the CPU heatsink is getting enough cool air it should be fine..put your lowest cfm fan on the top and highest cfm fan in the upper front (door).

Good luck
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dragon
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Phantek Menace
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CPUMotherboardGraphicsRAM
4770k msi z87 gd65 evga titan x gskill trident 2400 
Hard DriveHard DriveCoolingCooling
samsung evo samsung evo coolgate 240 xspc rx360 
CoolingCoolingOSPower
raystorm cpu & gpu block ek d5 pump & top win 7 corsair gs 700 
Case
corsair 750d 
CPUMotherboardGraphicsRAM
3970k rampage iv extreme gainward gtx 970 gskill ripjaw ddr3 2400 
Hard DriveCoolingCoolingCooling
sandisk extreme alphacool white monsta 360 coolgate 480  xspc raystrm 670 block 
CoolingCoolingOSPower
EK 970 gpu block d5 pump win7 SilverStone Strider Plus 1000W ST1000-P Modular... 
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Phanteks Enthoo Primo Ultimate Chassis White  
CPUMotherboardGraphicsRAM
2600k msi z77 mpower big bang gtx 570 kingston hyperx beast ddr3 
Hard DriveCoolingCoolingCooling
kingston ssd now v300 xspc rastorm cpu block ek fc570 se gpu block xspc rx240 rad 
CoolingCoolingCoolingOS
alphacool st 240 xspc bay res d5 pump win7 
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cm haf xb 
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post #3 of 5
1.) Yes, and exhaust.

2.) Loosing airflow to get under-pressure isn't worth it.

3.) "Front roof fan (exhaust) may "short-circuit" the CPU-cooler." Please elaborate?

P.S. Is it too late to twist your arm into a I5 build? lol. X-D
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Deus Ex Machina
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post #4 of 5
Thread Starter 
Quote:
could user fan controller/voltage reducers-even adding dust filters will reduce airflow-hard drive cages will slow it down too

Hmm, okay. I'll try it with reducing the spin until they even out. I don't feel comfortable hampering the airflow though, so I'll probably just go for overpressure in the end.
Quote:
3.) "Front roof fan (exhaust) may "short-circuit" the CPU-cooler." Please elaborate?

I read this Bit-Tech article were they claimed that the front roof fan in a very similar case pulled too much of the (relatively) fresh air stream away in front of the CPU cooler. They didn't include a lot of data to support it though. I was wondering if a front roof intake would provide fresh air to the CPU-cooler, or would just hamper the airflow...
Quote:
P.S. Is it too late to twist your arm into a I5 build? lol. X-D

Hehe, I tried to make the ends meet with an i7 at first, but decided to shift some money from CPU to GPU. AFAIK the FX 8350 outperforms the i5-3570K in benchmarks, so I decided to go AMD. The 3570K would also cost me €40 more. Btw, did I make a good choice in dropping the GTX 660ti in favour of the HD 7950?

Thanks for the advice! smile.gif
post #5 of 5
The problem with the front fan in the top is it sometimes moves the air too fast in front of the cooler intake fan thus causing the cooler intake fan to not be able to pull air into cooler as well as it could.

This can also happen with the side fan by the GPU.

Air is a fickled witch. Just because we design a perfectly logical airflow doesn't mean she will perform the way we expect. wink.gif

I pride myself in knowing more about airflow and air cooling than most and the fickled witch constantly blows air in my face and waltzes off laughing at me. frown.gif Just yesterday a guy had 3x 140mm plus 120mm exhaust fans and only 2x 120mm intakes... When he unplugged the top front exhaust the components got 1c hotter... I expected them to get a couple degrees cooler because more air in theory should have moved through the case...but no... the witch got the last laugh. frown.gif
Edited by doyll - 3/26/13 at 10:49am
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