I have two 670 GTX 4GB running in SLI with Adaptive on and it runs smooth. Ultra all on AA4X, HBAO, AA Post on low.
2 GB card may hurt with the 30" screen.
Heads up on this! :)
Error....... could not open device:\\.\PHYSICALDRIVE0
I had to turn off Hard Ware Monitor and it worked for me..... The error is gone.
Could be from programs running in background when testing. Turn them off.