- Aug 25, 2001
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I just installed my second, identical, Gigabyte "WindForce" dual-fan OC 715Mhz card, into my ASrock 990FX Extreme4 board, and installed the 2SLI bridge.
After booting into Windows, I was not automagically prompted to enabled SLI. I had to go into NV control panel, and enable it.
I was prompted to shut down my BOINC tasks that were using the GPUs (I have BOINC set to auto-start when Windows starts). So I did, then I clicked Continue, and it enabled SLI.
When I restarted BOINC, I noticed a bit of GUI lag that hadn't been there with a single GPU.
I also noticed, EVGA Precision 2.0.4 (that I use for fan and temp monitoring) was showing GPU2's fan speed as 900RPM, and the top card (#1) as 2400RPM. Sure, the top card was running a little hotter, but not that much of a difference.
So I un-installed that older version, and installed 2.1.2. Same issue with the RPMs. It was showing the top fan was running at 75%, so I manually set the bottom fan to 75%, and it reported 1400RPM, roughly half of that of the top card.
I took a piece of plastic, and I tested that both fans were working on both cards.
So this is a mystery to me.
When the cards were in seperate computers, there was no disparity between fan RPMs that I ever noticed.
Is this an artifact of SLI mode? Something wrong with Precision? Or something with my cards?
After booting into Windows, I was not automagically prompted to enabled SLI. I had to go into NV control panel, and enable it.
I was prompted to shut down my BOINC tasks that were using the GPUs (I have BOINC set to auto-start when Windows starts). So I did, then I clicked Continue, and it enabled SLI.
When I restarted BOINC, I noticed a bit of GUI lag that hadn't been there with a single GPU.
I also noticed, EVGA Precision 2.0.4 (that I use for fan and temp monitoring) was showing GPU2's fan speed as 900RPM, and the top card (#1) as 2400RPM. Sure, the top card was running a little hotter, but not that much of a difference.
So I un-installed that older version, and installed 2.1.2. Same issue with the RPMs. It was showing the top fan was running at 75%, so I manually set the bottom fan to 75%, and it reported 1400RPM, roughly half of that of the top card.
I took a piece of plastic, and I tested that both fans were working on both cards.
So this is a mystery to me.
When the cards were in seperate computers, there was no disparity between fan RPMs that I ever noticed.
Is this an artifact of SLI mode? Something wrong with Precision? Or something with my cards?