GTX 460 SLI Overclocking Settings in MSI Afterburner

Well, I am running the same settings you were, except my memory clock was at 2000MHZ. I'm running the Zotac gtx 460 768MB in SLI, and I use the EVGA precision tuner. I ran GTA4 for about 20 mins - since it's fairly demanding - with maxed settings, went for a car wash, lol and my computer froze. So I brought my settings down to 800mhz-1600mhz-1950mhz. Now I know the max temperatures are around 104C, from what i've read. I try to keep mine around the 60's. But I also wonder what is really stable and ideal running temperatures.

I have my case cool enough that my 460s usually don't overheat; immediately after I end a game, Afterburner says they're at about 65C. I haven't figured out how to adjust the core voltage to get above 850MHz.

What does GPU-Z say your memory clock is? The one you wrote above is either double or half of stock (so incorrect). Some utilities will report it incorrectly. The speed is 1000MHz actual/4000MHz "effective" on the FTW. My guess is your current mem setting is actually 1050/4200.

Also note, 900/3600 was stock (see here: http://www.anandtech.com/show/3809/nvidias-geforce-gtx-... ).

My system does recognize the OC - 850MHz Core Clock, 1100MHz Memory Clock, and 1700MHz Shader Clock

Yep, so 1100 is 4400 effective (a very good OC by the way), so you are faster than the FTW already.

Ok thanks; I didn't know how they calculated effective clocks.

Do you know of any stable voltage/clock settings? I know it differs a little for every user, but I don't know how I'm supposed to find a balance. Do I just guess and check?

I'll be with you on that question in a few weeks, but I don't have (a) GTX460(s) yet, so I don't know. All I can suggest is to test the 460 in either graphics intensive games (3D Mark works well too) or furmark/OCCT and keep a close eye on temperatures AND artifacts. If both are fine, try reducing your voltage (if you are happy with your speed) or raising your core clock. I will say though most reviews I've seen say the ram max is in the 1050-1060 range, so assuming you are currently stable, that is probably the best you'll do on ram. In terms of core clock, you are probably about maxed for stock voltages. To break 900 you'll need to increase GPU core voltage, and then you'll probably only reach 920-930. I think you want to keep temps under 80C.

I'm getting some small red and blue spots while playing Metro 2033 (haven't played any other games recently) that flash for a split second maybe once every 15 minutes or so. I tried bumping the voltage up to 1050 mV but they still occur. What can I do to fix it?

Try dropping your memory speed (try even down to 1GHz or stock).

If that doesn't help, try each card separately. It is possible one is failing. First try them at stock clocks though.

I dropped the memory clock to 2000 and the spots went away.

I wouldn't expect it to be the cards failing, rather the PSU, since I am pushing it a bit to the edge with 2 460s AND OCing them.

It was probably just the memory clock were too high. Most sites I've seen can only get 1040 or a max of 1050MHz. And when video ram is pushed too fast, really weird things can happen.

I didn't know the video memory acted up like that. Thanks for all the help!

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This is what i have my gigabyte gtx460 soc's running at