each Wafer Yield is specific and also each game / software.
My gtx 690 will not peform as yours, maybe mine will boost maybe higher, maybe it's yours because mine needs 1.175V for running @ 1200 mhz, and your better "yielded" card only need 1.125 to maintain stability at 1200 mhz ....
Got the same issue on the strongest workload with the gtx 690 when overvolting it :
you have to try different settings, to found out the best ratio between gpu clock vs memory clock vs voltage vs TDP threshold
the only way to prevent gpu0 (or 1) throlling back is to lower your voltage .... your gpu takes more "juice" assuming that it will "blow" easily your TDP limit and power target limit will start to kick in...
So obviously, doing this, power target limit will be not surpassed
: gpu will not start throlling.
you have to run the application like HEAVEN 4.0 or CRYSIS 3 and found the lowest vcore needed to maintain the same exact core clock on both gpu's, meanwhile maintaining a good temperature on both cores and not overpassing your power target limit you already set.
i think you should enjoy better performance with the two gpu's running a 1215 mhz without throlling, rather than the 1st gpu running still at 1247mhz and the second one fluctuating betwen 1084 mhz ( 70% of the time ) and 1247mhz (3 % of the time) if you know what i mean...
gtx 690 is using a specific over current protection (OCP), the gpu boost feature controls each gpu, calculating not the total consumption of the gtx 690, but for each gpu independently.
Power states are calculated directly on the moffsets and VRM circuitry ( GPU0/GPU1/MEM1/MEM2/PLX switch) and the GFX
The next "extreme" action you can do, it's to totally disable the power target limit, this "virtual threshold" done by Nvida (adding 300% PT threshold in bios ), but don't worry gtx 690 has differents safe mechanisms to prevent frying it
give a try !
Greetings from Paris, Sun is hot like ladies : D
i apologize for my poor english, it was really hard to translate geek and technical stuff in french into english one .Edited by lascar - 8/21/13 at 6:57am