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GTX 660 SLI not working?

Tags:
  • Gigabyte
  • 660
  • Gtx
  • SLI
  • Components
  • Performance
  • Galaxy
Last response: in Components
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August 19, 2014 11:15:13 PM

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 :??: 

More about : gtx 660 sli working

August 20, 2014 3:58:28 AM

"Is it my PSU not being adequate"

Well we can't answer that until you post the PSU info!

A pair of 660's need a 650w PSU according to this short thread: http://www.tomshardware.co.uk/answers/id-2166808/650w-p...

But the PSU brand is important too.

SLI/Crossfire isn't my thing, but maybe you need a matching pair of cards for best performance?
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August 20, 2014 5:18:11 AM

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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August 20, 2014 11:39:14 AM

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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August 20, 2014 11:39:44 AM

My bad it was only 700 watts :na: 
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