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GTX 660ti SLI Problems

Last response: in Graphics & Displays
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November 28, 2013 5:07:16 PM

Hi guys! I recently installed my 2nd GTX 660ti with 2 SLI Bridges in between them. Once I booted up I selected "Maximize 3D performance" in order to enable SLI.
I then did some Kombustor tests to benchmark but noticed that GPU 1 was being used at load 99% and GPU 2 was being used 0%.

I then ran 3D Mark 11, Ice Storm, Cloud, and Fire Strike. I got 60 fps on the first one but 35 fps on the second one and 10 fps on Fire Strike, I did these test with all the things maxed out. Why am I getting such low performance when I'm running 2 660ti both overclocked?

I then played a couple of graphics intense games like AC4 and Crysis 3 with Afterburner running in the background to see the GPU Usage. I'm getting 50fps with settings maxed out. GPU 2 is spiking like crazy and averaging at about 80% load when GPU 1 maintains a flat line and averages at like 20%. Why is it doing this, I thought SLI was supposed to split the load equally!

Can anyone help me, is this a scaling problem, CPU bottleneck, or anything? I feel like I just wasted $200 when I was expecting double the performance.

Specs and Rigs:
Running everything at 1080p
i7 3770k 3.5 GHz overclocked to 4.2 GHz (41 threads,I think I can push this up a little more to 44)
PSU: 750W Gold Efficiency
GPU 1: MSI GTX 660ti Power Edition Overclocked
GPU 2: MSI GTX 660ti Power Edition
Motherboard: Asus Z87 Sabertooth

More about : gtx 660ti sli problems

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November 28, 2013 6:36:47 PM

first, what exact power supply do you have? make/model?
check the temperatures of your graphics cards and cpu to make sure they arent overheating and throttling, make sure you have plenty of exhaust fans to get the hot air out of your case.
use driversweeper to remove all traces of nvidia drivers, reboot, install the latest nvidia whql driver from their website. enable sli. test again.

-edit - Did you say 2 sli bridges? you should only use one bridge. two bridges are for linking a 3rd or 4th card in sli.
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November 28, 2013 8:51:38 PM

iam2thecrowe said:
first, what exact power supply do you have? make/model?
check the temperatures of your graphics cards and cpu to make sure they arent overheating and throttling, make sure you have plenty of exhaust fans to get the hot air out of your case.
use driversweeper to remove all traces of nvidia drivers, reboot, install the latest nvidia whql driver from their website. enable sli. test again.

-edit - Did you say 2 sli bridges? you should only use one bridge. two bridges are for linking a 3rd or 4th card in sli.


PSU: Corsair HX 750

Okay, I'll remove the second bridge.

I have a huge case for my setup with plenty of ventilation, theres virtually no dust inside the case and I have yet to clean it.

I see a lot of temperature fluctuations in Afterburner while playing games, but normally the temp is really low.

I reinstalled the most recent driver but I did not use driver sweep yet. Will commence and then post results.

Thanks for your reply!
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November 29, 2013 5:26:15 AM

Kombuster does not have a SLI configuration. So it will only use one card.
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