BSOD while gaming, multiple errors

I've been getting BSOD's quite a lot recently. It only seems to happen while gaming.
I put in a new graphics card a couple of weeks ago, the one I took out was fairly old so I couldn't play many games with it.
I've been looking at the error codes but I don't think it's the same one every time, and I've no real idea of what I'm looking at any way.

I ran memtest for 4 or 5 hours yesterday with no errors, from what I've read since, I should run it for longer, so I'll do that tonight.

I've attached the SFDT zip.

Any help appreciated,
Philip

I've been running driver verifier for a while and this happened. This is new. I wasn't sure whether to let it continue or to restart it.

I ran driver verifier again, It made it through the night without a problem, then after using it for an hour the next day, ^^^that happened again.

I don't know if any of this is any help but I ran furmark, crystal disk and seatools, results attached

The above furmark screenshot is for a benchmark,
this video is of the test recommended here
It says to stop the test if you see artifacts.
Is the thing I'm pointing at something to be concerned about?

I can't embed the video for some reason, it keeps censoring part of the text.
https://www.youtube.com/watch?v=GhxZW4V6ImY&list=HL1386119216&feature=mh_lolz


Few other things I forgot to mention, I put a new power supply in with the graphics card, a cx500. I think it was around the 21/Nov, I'm guessing because I can't remember exactly.
When I put the new card and PSU in, I also put in a second hard disk(which I removed earlier today in case it was causing any of these issues).
Also, I think there were more crashes than there are dmp files, some were crashes to the desktop others were BSOD's that don't seem to have recorded.

Got some Memtest errors after leaving it overnight, are the bugchecks I'm getting consistent with failing RAM?