Radeon HD 6950 causing computer to crash

At least this is what i believe to be causing my crashes.

I've been having crash issues for some time now, mainly through games of all variety, though the games engine seems to make a difference.

Currently, Hitman Absolution, Far Cry, Duke Nukem Forever, Skyrim, Max Payne 3, as well as many others all varying in graphics quality, have been causing issues. The fallout 3 engine seems to be fine. Sometimes the computer crashes during Itunes visualizer.

Apart from the Radeon HD 6950 1024mb, i have;
750w PSU
Intel Core 2 Quad Q9550 2.83GHz
Gigabyte G41M-Combo motherboard
4gb DDR2 ram

I have updated all drivers, re installed windows 7, upgraded from to 64bit, cleaned hardware, i have even sent off my graphics card to be repaired, 3 very long months later i got it back and it had improved with merely delayed crash times as opposed to generally immediate. I have no issue with lag and have solid fps.

I have run FurMark to test for issues. The card seems to overheat as it gets hotter and hotter until the program is forced to shut down for reaching to high of a hardware temperature, however since the repair, the program can run for longer.

I've been advised that i may need to update my motherboard or processor, or perhaps get more RAM, as well as potentially changing my hdd. I'm using a fairly old, 2009 model HDD with only 250gb of space, it's half full, the rest of my stuff is on a 2tb and 1tb external. I've also been told that it might help if i change the internal hard drive, but that would mean opening the external drives case and voiding the warranty, i'd like to avoid switching hard drives if possible.

I'm well aware my computers current hardware setup should be able to play most games well, so i can only imagine one, or multiple pieces of my hardware have reached their planned obsolescence end date and need to be changed.

Any solutions? My card is not overclocked, i slightly increased fan speed to assist with cooling.
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  1. What make/model is that "750w" psu? So you say it overheats, do you have numbers for us to look at? What I mean is you should download and run hwmonitor and watch it until it crashes. Let us know what the max gpu and cpu temp is.
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