king game said:
ok try furmark for the test maybe 3Dmark06 is not doing well
run a few games and test their fps
make sure both the cards are fit in a bridge conn
Furmark will only heat the cards up but will not show if SLi giving any performance gains.
@OP, I assuming that you have the SLi indicators enabled? And try Vantage or a game known to like dual cards like COD4 or something similar.