Hi all.
Thanks for suggestions
I bought two 580's at the same time, one was for a friend and one for me.
Since my friend was away for 2 weeks I ran his card in my system for that length of time to check it was ok before forwarding it to him with no issues... I even undervolted it to 1.00 and it ran fine so that rules out the PSU I think.
The PSU has a single 12v rail and pulls 380w max from the wall with the GPU and CPU fully loaded so my system is not overtaxing it.
I have also tried several bios from Techpowerup just for the sake of experiment with no luck so it does indeed look like RMA time...
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