Degraded Crossfire performance

[Tom|Nbk]

For some unknown reason, tonight there has been quite a degrade in my crossfire performance just ran 3d Mark 06 and scored 1k Less (9127), i also noticed F.E.A.R performance was degraded with a single card running better than crossfire, it seems it wont properly initilalize also when i loaded up F.E.A.R trying to force AFR i got a bunch of mega artifacts im pretty sure the cards are both fine i tested for artifacts in crossfire and did a few runs of 06 to heat things up yet again no issues apart from the degraded performance, what could this be?, Any help appreciated . Specs in sig

 

[melbourne720]

Do either of the cards run faster than crossfire? Or just one of them? Could be PSU based, although your PSU is certified.