Quote:
Install at least one DIMM module on the slots. Memory modules can be installed on the slots in
any order.
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I copied that directly from your manual, this tells me that the stick should run in either dimm, but if the ram passed memtest it should be ok. I am not sure why it won't run in the orange slot on some boards this is a limitation but the way I understand the manual it should. This would be a good question to firer off a email to msi tech support.
In the mean time run prime again, run the torture test but this time check
"in place large fft's(max heat, power consumption)"
Run for 30 minutes or so and report your temps and voltages while it is running. I want to see if the voltages fall off at all.
In looking up the psu specs other than you have posted I have found that this psu comes with a case, thats about it no other info available, I suspect you are under powered with the video card you are running. Nvida recommends with pci-e that 12v rail should be 26A yours is only 20A.
Please read this in its entirety it will give you a better understanding on what I am trying to say
http://www.techsupportforum.com/showthread.php?t=107466
I am thinking that the psu does not have enough amps on the 12v to properly supply the video card, this is what I suspected in the beginning but in your very first post you said it happens during "normal activities" and I would think it should happen when the card is stressed such as playing a game. This is why all the tests, to try and eliminate other possibilities so if you could try this last test I am hoping it will revel something