Originally Posted by ZK2006
Then how do I ensure that both GPU's are working? I'm pleased with the card's current abilities and if, in fact, i'm only working 50% then i can only image how much better it could be. I have two instances of the card in the Device Manger if that tells you anything
Well it could be running single only in 3DMark.
check your 3DMark06 profile & make sure nothing is wrong. like v-sync disabled & SLI not set to single GPU rendering .. check the global settings aswell.