BSOD Graphic intensive games Win7 x64 varying errors

[Legatto]

System runs fine playing lower end games but once I start anything graphic intensive the game will BSOD within the first few minutes (Diablo 3 and War Thunder BSOD every time but Warhammer Dawn of War II never does for some reason and Final Fantasy online is wishy washy in that I could play for days without one or get two in a row within the hour). When it bsod it usually says uncorrectable hardware error but the actual error code varies.
This is not a new build. I built it a few years ago and have been swapping stuff out now and then but there hasn't been any hardware changes in the last few months. Everything was fine fore 3-4 months before the problems started. My system specs are in my profile and I followed the instructions and have attached the dump zip. If anyone could help it would be much appreciated.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 124
BCP1: 0000000000000000
BCP2: FFFFFA800C897028
BCP3: 00000000B6004000
BCP4: 000000005D000135
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

 

[Legatto]

Just popped into my head that I've also recently run Ccleaner and done a complete clean video driver install using display driver uninstaller.

 

[essenbe]

There are only 2 dump files both dated today. The only thing they show is an 0X124 error with no further information. A 124 error is a generic hardware fault, which can mean anything. What manufacturer and model PSU do you have and what brand and model GTX 770? What programs do you use to monitor GPU and CPU temps? I would suggest watching those very closely. What you described sounds like either over heating or a PSU problem. When you play a graphically demanding game, your Graphics card works harder so temps rise and it requires more power. The quality and age of your PSU makes a lot of difference. Also, be aware that CCleaner by default will clean out system error information as well as dump files. Those can be selected by reading what they are going to delete and uncheck those.

Also, a generic hardware fault can also be caused by a bad or conflicting driver. The driver can cause a piece of hardware to act in unusual and unexpected ways which the system interprets as a hardware fault. You may want to try a different driver and install it this way http://www.sevenforums.com/tutorials/327414-nvidia-drivers-avoid-problems.html

 

[Legatto]

The PSU is quite old so that could be it. Can't quite remember the manufacturer of the psu and gpu. Also sometimes when I wake my computer up my left screen (with my desktop) comes up all screwy and weird. If my computer has been asleep all day then that shouldn't be an overheating issue because after a quick power on power off of the monitor it corrects itself with no further problems (unless I start a game).

I've had problems with RAM failing in the past so my current course of action is to replace the mobo which has seen a lot of use and now the PSU per your suggestion. I'd also like to do a reformat as I've changed hardware on this thing like 10 times and at some point it's very possible that drivers got crossed somewhere along the line. I know formats aren't the best solutions but I'm kind of a hoarder when it comes to software and it will help me burn out the underbrush as it were.

Using open hardware monitor and all my temperatures idle are mid 30 Celsius except my mobo which is 38 and 42. starting Warhammer up (which has never bsod on me) everything but the mobo jumps up 10 degrees which should be normal right?