As mentioned, watch GPU usage while playing. The Afterburner On-screen display functionality is really good for this purpose.
Not getting usage consistently in the 90+ range is a reasonably good sign of a cpu BN (not 100% sure-sign, as other things CAN cause this, but it's a decent indicator). Note: v-sync has to be off, and you should always run full-screen because SLI in windowed mode is unreliable.
BC2 - could easily be BN'd as mentioned it's coded for 4 cores
WH - that CPU could limit you a bit for sure, but drops to 20fps due to cpu bn would be unexpected/extreme in my past experience. That CPU should be good enough to keep you over 30fps pretty much at all times.
Metro - cpu could also possibly limit you a bit in that one if you're running at settings easy enough to put your average around 60fps. Although big fps drops are *very* common in that game no matter what rig you have.
EDIT: Alright guys. I basically played the first few minutes of Warhead while Afterburner was open on my second display. GPU usage was basically identical on both gpus, fluctuating between 40-50 at the start then hitting 70-80 once you jump over that broken bridge. At this point I noticed massive artifacting. it was like the shadows of every object was out of sync and were popping out. Do you guys think the PSU might be the problem? maybe its not giving enough power to the cards.
I'm gunna test out the EVGA card alone without the SLI hack enabled. I purchased it used for $70, maybe the dude knew the problems and thats why it was so cheap. but i doubt it since the guy was very helpful and even gave me the EVGA account that was used to register the card.
Edited by lanken123 - 2/3/11 at 11:29am