Going from memory, as I'm not at home:
PSU is 750W so I don't think it's a power supply issue unless the PSU is failing.
GPU is a 2GB Radeon 6950 so it should be able to handle quite a bit, and has, with no issues up to now and no changes to the game before the problem started - so again, unless the hardware is outright failing, it shouldn't be that. It's the newest hardware on the system, only about a year old.
The rest of the rig was built from scratch two years ago and all relevant internal hardware was bought new at that time... I think the only things I kept from the old set up were an external backup drive and possibly a DVD drive. I checked already and have the latest BIOS stuff, no updates available for mobo or chipset. I did make a couple small changes to the BIOS setup to see if that made a difference but it didn't so I changed it all back since it had been fine for two years up to now.
I check the inside periodically to blow out any dust (and there usually isn't much) and make sure all the fans are running properly; I've got mesh screens over all the intake/exhaust openings and keep those pretty clean as well. And when I was monitoring temps last night, I got no red flags there even when the game was up and running in fullscreen with all my desired mods in place.
Anyway - I played for two hours with no problems, and prior to that couldn't play for two minutes without a BSOD since the weekend. If I don't have any more problems, I'm not gonna worry about it.
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