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SLI cooling question

post #1 of 4
Thread Starter 
I just got another GTX680 to go SLI. In order to get full 16x on both cards for SLI on my board I need to use the top 2 slots. That means the cards will be sandwiched together. I will have my MSI GTX680 TwinFrozr card and the new card just has a reference cooler on it. What would be the best configuration....the TwinFrozr as the top card and reference cooler on the bottom or switched? All my system info is current in my sig if you need to reference anything.

I'm guessing the TwinFrozr on top beings it the cooling on it "should" keep it cooler than the reference being the top card that gets less ariflow. The other option would be to use the top and bottom slots. I beleive by doing that, they would be only running 16x 8x then....if that would even work because Gigabyte says to use the top 2 slots for SLI.

I did at one time have SLI 470's sandwiched on this same board and the top card ran about 5-10C hotter and of course was louder than I hope these 680's will be. The 470's were both reference coolers so I was not concerned with which went where and I had a different case at the time so I couldn't use the bottom slot then because there was not enough room between the bottom slot and the PSU. Now with my 500R, I have enough room to use the bottom slot if that would be a better option.

Here is a pic of my open case if you want to see what it looks like for reference.

My Rig
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 D0 @ 3.8 Ghz Gigabyte EX58-UD4P MSI GTX 680 Twin Frozr OC 3x2GB G.Skill DDR3 1600mhz 
Hard DriveHard DriveOptical DriveCooling
Crucial M4-64GB WD Caviar Black-1TB ASUS DRW-24B1ST Corsair H80 
OSMonitorKeyboardPower
Windows 7 Pro 64bit Asus VG248qe Logitech G15 Corsair TX750 
CaseMouseMouse PadAudio
Corsair 500r (White) Razer DeathAdder 2013 Razer Vespula Creative X-Fi Titanium HD 
AudioOther
Audio Technica AD700 bitfenix recon 
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My Rig
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 D0 @ 3.8 Ghz Gigabyte EX58-UD4P MSI GTX 680 Twin Frozr OC 3x2GB G.Skill DDR3 1600mhz 
Hard DriveHard DriveOptical DriveCooling
Crucial M4-64GB WD Caviar Black-1TB ASUS DRW-24B1ST Corsair H80 
OSMonitorKeyboardPower
Windows 7 Pro 64bit Asus VG248qe Logitech G15 Corsair TX750 
CaseMouseMouse PadAudio
Corsair 500r (White) Razer DeathAdder 2013 Razer Vespula Creative X-Fi Titanium HD 
AudioOther
Audio Technica AD700 bitfenix recon 
  hide details  
Reply
post #2 of 4
if it works the best option is to use the first and third slot, I think u will not notice a difference in fps for being 8x, just run any benchmarks like Heaven 4.0, for testing.
In the other case you are right, the TwinFrozr is more ventilated, will be better on top
post #3 of 4
Thread Starter 
Quote:
Originally Posted by Enrainn View Post

if it works the best option is to use the first and third slot, I think u will not notice a difference in fps for being 8x, just run any benchmarks like Heaven 4.0, for testing.
In the other case you are right, the TwinFrozr is more ventilated, will be better on top

Thanks for the input. Although after doing a little research I have read that having a non-reference cooler on the top card can actaully heat up the back of the bottom card if they are sandwiched because the dual fan card does not blow heat directly out the back. Not sure if that is entirely true, but it does make sense. I know the only way to know for sure is to test both ways, but wanted to try to get it in the best way the first time to avoid taking the time to switch them back and forth. I don't beleive I will lose that much performance between 16x 16x and 16x 8x, but want to get as much as I can out of these cards in SLI.
My Rig
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 D0 @ 3.8 Ghz Gigabyte EX58-UD4P MSI GTX 680 Twin Frozr OC 3x2GB G.Skill DDR3 1600mhz 
Hard DriveHard DriveOptical DriveCooling
Crucial M4-64GB WD Caviar Black-1TB ASUS DRW-24B1ST Corsair H80 
OSMonitorKeyboardPower
Windows 7 Pro 64bit Asus VG248qe Logitech G15 Corsair TX750 
CaseMouseMouse PadAudio
Corsair 500r (White) Razer DeathAdder 2013 Razer Vespula Creative X-Fi Titanium HD 
AudioOther
Audio Technica AD700 bitfenix recon 
  hide details  
Reply
My Rig
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 D0 @ 3.8 Ghz Gigabyte EX58-UD4P MSI GTX 680 Twin Frozr OC 3x2GB G.Skill DDR3 1600mhz 
Hard DriveHard DriveOptical DriveCooling
Crucial M4-64GB WD Caviar Black-1TB ASUS DRW-24B1ST Corsair H80 
OSMonitorKeyboardPower
Windows 7 Pro 64bit Asus VG248qe Logitech G15 Corsair TX750 
CaseMouseMouse PadAudio
Corsair 500r (White) Razer DeathAdder 2013 Razer Vespula Creative X-Fi Titanium HD 
AudioOther
Audio Technica AD700 bitfenix recon 
  hide details  
Reply
post #4 of 4
GPU's are not even close to utilizing the full 8x lane. So you would not see a performance decrease. What you would see though is an increase due to a smarter decision of keeping them further apart and cooler, allowing for higher overclocks.
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