BSOD pagefault in nonpaged area 0x00000050 ntoskrnl.exe+75bc0

It's saying your video card

Code:

Use !analyze -v to get detailed debugging information.
BugCheck 7E, {ffffffffc0000005, fffff8800f174160, fffff88005326dd8, fffff88005326630}
*** WARNING: Unable to verify timestamp for atikmdag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmdag.sys
Probably caused by : atikmdag.sys ( atikmdag+cd160 )
Followup: MachineOwner

I can't believe you had 2 bad video cards. We have run every test I know to run and you've passed them all. I also find it hard to believe you were having basically the same problems with 2 Motherboards.
We have run Seatools for your hard drive
Memtest86+ for the ram, furmark for the Video card.
The only test I don't remember running is Prime95.r Did we run that? It is basically a CPU test but is a general system stability test. It will cause your CPU temps to go extremely high, so you have to watch them very closely and stop the test if they get too high. I use Core Temp for CPU Temps (Core Temp) as always whatch out for the add on programs they like to include with it and opt out. Hardware - Stress Test With Prime95 Use Prime95 or AIDA64 which is not free, but has a 30 day free trial. Downloads | AIDA64

It's up to you, but it really needs to be run for several hours. I run it for 18-24 hours, but I don't expect you to do that. I woupd think for 5-8 hours anyway. How much free space do you have on your hard drives? And, your error is a memory violation. That does not necessarily mean ram, it could be video memory or virtual memory.

I always run blend. But don't run it when you can't watch it. You have a hot running CPU anyway, you need to keep watch on it and shut it off if it gets too hot.

OK, sounds good. I'm running out of ideas. We've run just about every test there is. But, even if you got 2 bad motherboards, the odds of them having the exact same problem is highly unlikely. Same with graphics cards. I'll try to ask for some help, and see if someone else has some fresh ideas.

Well, it doesn't seem like I was much help at all.