MSI R6870 Twin Frozr II Random Crashes

Hello,
I have had an MSI R6870 Twin Frozr II video card for the past year, and it has been operating without problems for most of that time. I have been slowly upgrading my computer over past 5 years, but keeping the same motherboard and CPU. A few months ago I started having issues with it:
While playing video games or browsing the internet the video drivers crash and recover after a few seconds at random times, approximately once every half an hour. 30% of the time, the card crashes and doesn't recover at all, with a black screen, prompting a restart of the system.
Last month I have rebuilt my PC: kept the same the video card, 750W power supply (both 1 year old) and all my hard drives. I reinstalled the same version of Windows 7. I made sure to take precautions against static in the process. However the problem persists.
Because I have my power button set to a restart, I am able to have the computer perform a soft reboot every time when the screen goes black, rather than forcing a hard reset, so to me this means the new CPU, Motherboard and RAM are working OK. Also on occasion switching my monitor cable between the two DVI outputs brings the image back.
Here are some of the other things I have tried so far unsuccessfully:
Updating the motherboard and bios drivers to the latest version
Using a tool to delete and reinstall latest ATI drivers (12.9)
Using ATI beta drivers (12.11b)
Using both windows and 3rd party memory check tools (both came back OK)
Changing RAM settings from 1600 to 1333.
Underclocking the video card (although it runs pretty cold and I have a dedicated fan installed right underneath it).
I will welcome any other suggestions.
Thank you in advance,

Here is an update on my situation:
I went out a bought a new PSU, Antec HCG-620M, but the problem didn't go away. I'm still trying to keep up with the latest drivers. However most games that require high performance (i.e. Witcher 2 out of the older, more stable games) remain unplayable due to fairly regular random video card crashes. Older games with lower specs play fine though. I have also been running SpeedFan in the background and have seen an occasional spikes in the video card's operating temperatures (as high as 81C) but crashes occur at any temperature.
Help would still be appreciated.
Thanks,

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