I just got mine and was wondering how to find the limits of overclock; from little OCing I did in past; I am impressed with this thing.
 
I used the valley 1.0 which comes in the CD and following are the results.
 
Test @ 1080p * 4 AA * Ultra
 
Stock settings,
Valley benchmark reports: 1531 Core, 3505 Memory, Max temp at 73
 
FPS:56.1
Score:2347
Min FPS:24.4
Max FPS:65.7
 
Tweaked settings: Core clock: 110+, Memory: +495
Valley benchmark reports: 1641 Core, 4000 Memory, Max temp at 73
 
FPS:57.9
Score:2423
Min FPS:26.0
Max FPS:64.0
 
1) Does it really running at 1641? I ran MSI afterburner at same time and that was reporting core clock in the lines of 1500ish. Which one to believe?
2) How long do you run it to assume that its a stable OC. 1 hour, more?
3) Anything else I should check?
 
Thanks

my 960 is stable @ 1544/8000. valley also reported 1644mhz/4000mhz. the card has been running all day @ 26c idle and 54C benching, 40ishC gaming.

yep, it was confusing me too. for some reason it was adding the additional +110mhz to your already max boost.

Boost 2.0 will add extra MHz to your card. I recommend you to watch theese values, and as soon as they drop a bit downclock the card. Thats the main reason you see different values in benchmark and MSI Afterburner. Most likely it hit the power limit and just throtttle down to keep the chip safe. I've been experiencing lots of throttling with 1415MHz Clock - read from GPU-Z on K-Boost, when I stressed the card it went down to 1390MHz (GTX 970 ACX 2.0). I found that hitting the power limit can lead to 1sec black screens(driver crashes), just hope that 350.12 driver will fix that.
Don't ever care about Voltage - most of the cards can't go over 1.212V, mine is hitting 1.200V and I can't get it higher. I would recomment to put +37.5V at your OC software to get your card stable while turning between P00 and P02 (without it card might be unstable during level start etc.). And its very important to use games for stress-tests. GTX9xx are running bit slower as a safety measure for furmark and ungine (It seems that 3DMark don't have such a issue). If your chip is high quality one you might get to 1500MHz/8000Mhz. I think it would be wise to watch GPU-Z's perfcap reason sensor - it really helps just make sure u get always Vrel,Vop (blue and yellow) when in use, as soon as you get pwr (green) downclock a bit. As for ssc LED check Geforce Experience.
Hope it helps and sorry for bad english.

The Valley benchmark has always reported the GPU core clock speed wrong. (higher than actual)  MSI AB or PrecX will report correct speeds...

I did some more testing and I am getting more impressed by this card.
 
on everything stock it goes to 1405 boost clock.
 
If I change bios switch; I can increase the voltage to 1.23x but mostly its stuck at 1.212; with extra voltage it runs to 1560 but comes down to 1540; and it passed benchmark at 1540. So benchmark stable at 1540. Nice

DeathAngel74
its dropping to 1540 from 1560 because the voltage is dropping, therefore core and boost drop too. 1243.0 should get you to stable 1560

 
Thanks will try that.