Hi! I have an issue like yours...
i7 2600k @ 4.5 GHz
16 GB Corsair Vengance 1600MHz
GeForce GTX 590 @ 4-way-SLI
I got around 15000 points earlier but for some reason the test now runs at 14-18 FPS where it was around 60-100 before.
Something is definetly wrong..and i dont know what