Ok,
So I have two Asus GTX470's in SLI. I came home yesterday night and started playing BF2142 and during the game I was getting random pauses where the video would stop, but then restart as though nothing had happened. I went and uninstalled all my Nvidia software, i.e. Nvidia Physx, Control panel, etc. I then used driver sweeper from Guru3d under safe mode to remove all the drivers and what not. Then I reinstalled the 257.21 drivers, again under safe mode. Went in and started playing the game and still got the random pauses. I started the game over and had GPUz running this time so I could monitor my cards on the second monitor. I noticed that my GPU clock kept dropping from 607Mhz (stock) to 405Mhz during the game and the voltage would drop also. So I disabled my main card using the RE3 onboard PCIe on/off switch. The pauses went away, but I noticed the same fluctuations in my GPU clock. Any ideas what could be going on?

My setup is as follows:
RE3
980x @ 4.138Ghz
2 x Asus GTX470 at stock speeds
2 x Intel 80Gb G1 SSD in RAID 0
Enermax Revolution 950 PSU

Cooling is:
CPU is water cooled
GTX470's are water cooled by a Koolance GPU-220 GPU only block with the stock sink for the memory and VRM's. My temps never exceed 42c under load.

I haven't done any bios flashing on these cards and as I stated before I uninstalled the drivers, used clean sweeper to clean them off the system and then reinstalled the drivers.

Any ideas would be helpful. On a side note, I did have an issue with my system not wanting to boot at my overclock settings the other day, left it alone over night and everything went back to normal. Not sure what is going on, it's like I have gremlins in the system messing with everything.

Thanks.