I'm pretty sure the TruePower New 650W (TP-650) was not available in 2007. The older TruePower lineups (original, 2.0, Trio) were considerably worse than the TPN, which is an excellent unit. The above review linked is for the TruePower Trio (TP3-650). Previous TruePower were TP-II and TRUE and did not include 650W variants.
Here's a review of the TP-650:
Reviews of the TP-750, which is the same platform and pretty much the same thing:
It would easily handle Crossfire HD 6950s, never mind single GPU systems.