GTX 660 SLI not working?

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Max Sutter

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Jun 27, 2013
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So I bought a Galaxy 660 a while ago and shortly after I got a Gigabyte 660, there wasn't a huge performance jump when I got the second card but i thought maybe that's all SLI gives you, today the Gigabyte card's fans stopped working, the block was getting hot so the GPU was on I guess. I ended up having to remove it because my system would crash if I used it for too long. After removing the Gigabyte card and leaving the Galaxy one in I noticed the performance was the same. Is it my PSU not being adequate or is it something wrong with the Gigabyte card?

I just really want to know what's going on :??:
 
Solution
chesteracorgi
Mixing and matching GTX 660s in SLI is OK as long as the the chip set is the same. You don't need to match the brands. It is a concern that the Gigabyte's fans stopped working. I'd bench test that card separately, and if it didn't perform properly, would RMA it.

Now a question: Did you set your Nvidia control panel to 3D/SLI? If you did not set it up for SLI it defaults to using the second GPU as Physx.

And Phil is correct on the PSU: we can't help where there is no info.
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chesteracorgi

chesteracorgi

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Apr 11, 2011
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Mixing and matching GTX 660s in SLI is OK as long as the the chip set is the same. You don't need to match the brands. It is a concern that the Gigabyte's fans stopped working. I'd bench test that card separately, and if it didn't perform properly, would RMA it.

Now a question: Did you set your Nvidia control panel to 3D/SLI? If you did not set it up for SLI it defaults to using the second GPU as Physx.

And Phil is correct on the PSU: we can't help where there is no info.
 
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Solution
M

Max Sutter

Honorable
Jun 27, 2013
16
0
10,510
Both cards were both 2GB GTX 660s and I had a 750 Watt OCZ PSU. I did have SLI enabled in the NVIDIA control panel. But I noticed when I had to power fans directly from the PSU some of them wouldn't work unless they were connected in a very specific way to the PSU
 
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