A lot misinformation here. The top card is the GTX 550ti. Then the 7750, then the 6670.
@ pc 1: What kind of power supply do you have? Because there are performance differences between all these cards and all of these cards use different power.
The 7750 and the 6670 does not need the Power Supply connected to the cards.
theres a difference between the 6670 and the 6770
that in question right now