Flit, the Coolman rig that I got has a 600W PSU and runs a dual 8800GTX (one card, dual heads) and has 6-pin power connectors. I'm in a similar situation as you atm.... I wan to to upgrade this system and put in other drives but can't as I have 4-pin drive (molex) power connectors to 6-pin PCI-E power conectors and have NO power connectors left. It is a 600w PSU.
The NEXT PSU you get SHOULD (depending on price) include 6 or 8 pin PCI-E connectors and/or cable management. My next one wil be a Thermaltake 800w PSU (w/h cable management - meaning, you connect WHAT YOU NEED to the PSU. Less cables
![Cool 8)](./images/smilies/icon_cool.gif)
) so I can put another drive in, along with another optical drive.
![Cheers :cheers:](./images/smilies/orig/icon_cheers.gif)
Save the peanuts Flit and u/g the PSU.
![Cool 8)](./images/smilies/icon_cool.gif)
EDIT: DO you still have ONE of the 8 series gfx cards? If so, run that instead of the 9 series and see if the same issue occurs. Another diagnostic could be get a seperate drive, clean install the OS, clean install the game and play for a while. If the same thing happens, that rules out software (do that test with 1x 8 series gfx card).
If when running 1x 8 series gfx card the issue doesn't reappear (from either original system or clean install drive), then it would confirm most people's suspicion of a PSU issue.
![Cool 8)](./images/smilies/icon_cool.gif)