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CM 690 II Advanced proper airflow dilemma

post #1 of 11
Thread Starter 
Hi guys!

Just want to ask a few questions since im still not at peace regarding the proper airflow for my case.

here is a pic of the airflow of my current setup



Actual pic



now im not sure if it is correct. ive read somewhere that top fans should be pulling air in then rear will exhaust the hot air.

also as you can see, im planning to add a 120mm fan on the bottom but im not sure if it is good since i already have a 120mm attached on the hdd cage.

also i have the clear panel version and im not sure if ill place a fan there. if yes, will it be for intake or exhaust? i tried place intake fan there but it was too noisy.

regarding the 5.25 slots, its fully packed now since i placed my res/pump, odd and fan controller there.

your inputs, suggestions will help me alot!!!

thanks in advance guys!
AMD Rig
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CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
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AMD Rig
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AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
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post #2 of 11
Use to have this case and i had it setup the exact same way ....cooled great.
post #3 of 11
Thread Starter 
@pmrballer123

i can agree with that! thanks! but im thinking if the airflow is correct or any other suggestions would be great
AMD Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
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WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
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AMD Rig
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CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
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WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
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post #4 of 11
Looks good.

Alternate ideas:
- intake radiator at top, exhaust into case
- or rear intake fan, exhaust threw radiator at top

You may or may not get better temps this way.
Edited by Riou - 5/9/11 at 8:36pm
post #5 of 11
Thread Starter 
@riou

thanks for the input! you gave me an ide for the rear exhaust to be an intake also. hmm and wouldnt it be to harsh for the rad since all exhaust will be forced through it? but great suggestion! might try that since cold air from outside will pass through that and will be a lot shorter travel to the rads + rep for you!

other inputs are still welcome!!!
AMD Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
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WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
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AMD Rig
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CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
Hard DriveOptical DriveOSMonitor
WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
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post #6 of 11
My comments/suggestions:-
1) Fan on side panel: with your existing configuration, put your hand over that opening without a fan. If you feel a small flow of hot air coming out, then you should install an exhaust fan to help. If you feel a small flow of cold air being pulled in, then install an intake fan.
(Do this step after you have done step (2) below)

2) Case rear fan should not run too fast as it will take away air trying to enter the radiator. It should not used as intake as it will likely to suck hot air from outside, especially the hot air exhausted from the card and PSU. Set it to spin as slow as possible.

3) The main issue with your current setup is fresh air supply to the rad. The ideal location for fresh air intake is via the case's 5.25'' bay area which is already fully taken up. And, your graphics card basically dissects your case into an upper half and a lower half. Air intaken into the lower half (via the case front fan and case bottom fan) cannot reach the upper half easily. If you have the regular side panel, its upper fan opening is ideal to provide ambient air into the case. Unfortunately, you have the windowed side panel whose fan opening is in the lower part.
If you revert the rad fans as intake, you run the risk of having the hot air from the case rear being recirculated into the case due to the top intake fans.

4) I would suggest you to:
a) move your graphics card from the topmost PCIe slot down to the fourth slot (which also supports PCIex16), thus freeing more space for front intaken air to move up to the upper half (see green arrows in pic)
b) move the single HDD down from topmost slot to a lower slot (blue arrow)
c) move current fan (tied to HDD cage) further down
d) take out all unused HDD plastic holders as they provide some resistance to air flow

These steps could help for air to move to the upper zone to benefit the top rad.

Edited by windfire - 5/9/11 at 8:49pm
post #7 of 11
Thread Starter 
@windfire

owww thats nice. i get your point regarding the rear exhast not to be made as intake since hot air from psu and gpu arises. noted.

regarding the fan on the hdd cage, is it possible that i let it stay on the same place since im planning to put an intake on the bottom that will directly blow air to the gpu? or can i just forget about adding another fan at the bottom?

lastly, will it not affect placing my gpu on the second slot? maybe video problems?

Thanks!!!
AMD Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
Hard DriveOptical DriveOSMonitor
WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
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AMD Rig
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CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
Hard DriveOptical DriveOSMonitor
WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
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post #8 of 11
Quote:
Originally Posted by sabawballs View Post
an intake on the bottom that will directly blow air to the gpu
That's what works best for my set up. I tried the fan on the hard drive cage in both of the available positions. But having a fan directly underneath worked better. MY 6950 is the reference version with the blower style fan, btw. If it were a Twin Frozr or used some other cooler that exhausted air inside the case rather than outside, I don't know how much a bottom mounted or HDD cage mounted fan would help.

Unless you'll be adding more drives, you could also uninstall the HDD cages to allow for more open space for air to move in the case.
MRBIGGLESWORTH
(16 items)
 
  
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955 Black Editon C3 Gigabyte 870A-UD3 MSI 6950 2GB (Ref) 8GB HyperX Blu 1600 
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Crucial M4 2x64GB RAID0 Spinpoint F4 320GB Spinpoint F3 1TB CM V6GT 
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MRBIGGLESWORTH
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Crucial M4 2x64GB RAID0 Spinpoint F4 320GB Spinpoint F3 1TB CM V6GT 
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post #9 of 11
Thread Starter 
@yakuza

actually im using the reference design also as you can see in the pic. will i remove the one on my hdd cage and place it at the bottom? or place another 120mm at the bottom so this means that the bottom fan is directly blowing air to the gpu and the one at the hdd cage ???
AMD Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
Hard DriveOptical DriveOSMonitor
WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
KeyboardPowerCaseMouse
Logitech MK320 Seasonic M12D 850w 80+ Silver Coolermaster 690 II Advanced Logitech MK320 
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AMD Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II x4 965 BE @ 4.0GHz 1.412v (bios) MSI 790FX - GD70 Powercolor HD 6970 Reference Design G.Skill 4GB (Dual) DDR3 1333 7-7-7-21-28-1T 
Hard DriveOptical DriveOSMonitor
WD Caviar Black 640GB Lite-on DVD-RW 24x Windows 7 Ultimate x64 Samsung 2253LW 
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post #10 of 11
Quote:
Originally Posted by sabawballs View Post
@windfire

owww thats nice. i get your point regarding the rear exhast not to be made as intake since hot air from psu and gpu arises. noted.

regarding the fan on the hdd cage, is it possible that i let it stay on the same place since im planning to put an intake on the bottom that will directly blow air to the gpu? or can i just forget about adding another fan at the bottom?

lastly, will it not affect placing my gpu on the second slot? maybe video problems?

Thanks!!!
Let me further refine/explain the airflow plan as follows:- (see pic below)

a) move the fan next to the HDD cage to the case bottom as intake (horizontal blue rectangle in pic). This move has a 2-fold purpose:- to point air directly to the intake fan of the card and to reduce volume of airflow from case front intake fan into the area underneath the card.
Now, the card primarily receives its fresh ambient air from this fan.

b) with (a) done, the case front intake 140mm fan is now primarily to supply fresh air to the upper half of the case, benefiting the rad. If it is possible, consider replacing this 140mm fan with two 120mm fans (the 2 vertical blue rectangles in pic). A pair should be able to channel more air in.

c) moving the graphics card from the topmost PCIE_E1 slot to the PCIE_E4 should pose no problem whatsoever as far as I can tell from the User Manual. See pic 2 below showing page 2-22. As you mobo is a 'high end' one and more importantly it is a fairly new mobo, it should support booting up with a graphics card not installed in the topmost slot. This move will increase the airflow passage gap (marked by an orange arrow in pic 1) so that air can move into the upper half more easily.


Edited by windfire - 5/9/11 at 11:52pm
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