GTX 485M SLI overclocking

I oc my 485M sli to 740/1700 (flashed the vbios and increase the max voltage to 1.03V) and can easily run and finish the 3DMARK11 3DMARKADV and 3DMARK06's test. But can not run Furmark. It only lastes 1min in Furmark and the system go black sreen and restart. The temperature during runing fumark only went up to around 65c before shuting down.
Is that mean 740/1700 is not stable?

I can only completely run furmark without any problem under 640/1550. Is that the highest overclocking 485M sli can get?

BTW, i am using 2 300W power supply and these should give a total of 600W power.

 

means your 740/1700 OC is not 100% stable.

 

If you're having issues running any of the benchmarking or stress testing apps when overclocked, it means you've either reached beyond your max stable overclock or you're overheating. If you're not seeing any artifacts before black screen, check your temps as you may be overheating and shutting down. Furmark in particular is a doozy on temps.

65C wouldn't be enough to shut down for high temps though, so it may very well just be too high of an overclock to be stable. Changing voltage in particular is iffy when dealing with laptops.

 

I tried changing the voltage back to 1.00V but the problem remained.

Just curious if a single video card can be overclocked to 740/1700 and stay stable, it shouldn't be much lower than that to overclocked sli video cards. And the temp. does not increase a lot. At least far away from the max temp. to shutdown.

And there is no any other sign before black screen and shutdown. Even I only oc them to 650/1500. That's only 10hmz more on core than my furmark fully run oc (640/1550) . I believe if only 640 could work and 650 doesn't. That should be a video card driver reset other than a black sreen and shuting down.

BTW, the temp. doesn't increase at all when I oc it to 640/1550 compares to 575/1500.

 

Have you tried running the benchmarks on the stock clocks and on underclocks?

 

yes I did. But not underclocks. there is no problem with that.

 

If everything is running fine on stock clocks than there isn't an issue with a card. Try OC'ing in small increments and test each time until you fail, then revert to the last good clock.