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Trouble overclocking msi gtx 660 twin frozr (non-ti)

Last response: in Overclocking
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May 18, 2013 7:08:09 AM

So I'm using MSI Afterburner to do my overclocking, and I have a 750w continous power supply. But when I overclock I can only seem to run any game for about 10-15 minutes before it freezes. Metro Last Light will just freeze and BF3 will say "Direct X Error". When I don't Overclock the game plays fine. Here are the values I've recently tried that also didn't work. Core clock +50mHz, power 110%, memory clock 0%. It's not that the card is getting too hot, it seems to stay under 45. Any ideas as to why this is happening? I would really like to get the most out of these cards. Thanks.

Here's my rig
i5-3570k
8 gb fam
MSI geforce gtx 660 twin frozr oc iii SLI
750w antec continous power
z77 extreme4
May 18, 2013 8:25:18 AM

What is happening is that is not a stable overclock.

I have one of those cards and it overclocks like a dead slug. I can't get +50Mhz on the GPU clock either, I'm not even sure if + 40MHz is stable.

What overclocking utility are you using? Since version 2.3.1, MSI afterburner no longer offers me the option to increase power and as far as I can tell, upping the GPU voltage does nothing.
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May 18, 2013 9:27:14 AM

Optimus_Toaster said:
What is happening is that is not a stable overclock.

I have one of those cards and it overclocks like a dead slug. I can't get +50Mhz on the GPU clock either, I'm not even sure if + 40MHz is stable.

What overclocking utility are you using? Since version 2.3.1, MSI afterburner no longer offers me the option to increase power and as far as I can tell, upping the GPU voltage does nothing.



I'm using msi afterburner. All it let's me do is change power output to 120 percent.

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a c 81 K Overclocking
May 18, 2013 9:28:48 AM

It's called you can't overclock it. It's that simple. You can always flash a custom bios for the GPU to allow you to raise the voltage, but it's dangerous and voids the warranty.
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June 2, 2013 1:40:51 AM

Try these clocks - +85 core + 306 Ram +110% volt, for me it runs stable atm, tested on BF3 all on ultra.
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June 2, 2013 7:42:19 AM

Has anyone told you about the silicon lottery? Just cause 2 cards are the same model doesn't mean the silicon underneath is identical. Our cards can't get more than +50Mhz on the core, so no way in hell are they going to get +86.
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June 2, 2013 2:52:37 PM

I'd try max power target. If you are hitting 130%+ on TDP after a Heaven run with +40mhz on the clock, then sorry, you have no headroom. You won't go any higher.
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June 2, 2013 7:25:34 PM

I've just decided to not mess with it. These two cards are running everything I want just fine, and I don't want to be playing a game and then have it just freeze on me. Thanks for all your guys' input.
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June 3, 2013 4:12:23 AM

I don't even have to option to change the power target anymore, not that it ever did anything anyway.
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a b K Overclocking
December 8, 2013 5:36:32 PM

Afterburner has an option that allows you to unlock voltage control and monitoring. I've had the same problems overclocking my N660's SLI to anything above +40 core clock. Usually my drivers will say they've stopped responding and recovered. Thus far the only stable overclock I've attained with a 750W PSU is +40 Core clock, +273 Memory Clock, with no power adjustments.
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February 16, 2014 5:15:28 AM

I'm running 2x 660 TF in SLI and I have to UNDERclock them by 20 mhz on both memory and GPU + put power to 119% and overvolt them at 62,5 mV to get them to not crash every minute.


In all honesty I'm massively annoyed with this card and it's SLI performance. It's just as instable as it gets.
I didn't buy 2 of these just to have to underclock them etc.. but yeah there you have it.
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a b K Overclocking
February 17, 2014 1:26:28 PM

I used to have a GTX 660 SLI setup, even the same two MSI cards you have. They really don't overclock well at all. My stint with them I think the best I ever achieved was +40MHz Core Clock, and maybe +235MHz on memory.
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February 17, 2014 1:29:17 PM

Powerbolt said:
I used to have a GTX 660 SLI setup, even the same two MSI cards you have. They really don't overclock well at all. My stint with them I think the best I ever achieved was +40MHz Core Clock, and maybe +235MHz on memory.


hmmm yeah... well I don't even need any OC.. just want to run them at the factory settings. :( 

having said that.. with the adjustments I made I can pretty much run any current FPS game at it's highest settings or close enough without much trouble.
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