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I read your post a couple of days ago, but I was enable to login dued to an issue of the forum. I remember it was about disabling hdmi and other misc things.
By the way I have a 5870 and I "fixed" underclocking the memory by 125MHz, not a true fix.
Seriously, do you think it's normal let a common user doing all you listed above to make a 300 € card worth working?
Having paid 300 € I would demand the card to plug itself in the case, leave apart the fact it shouldn't cause any trouble in normal use.
I experienced GSODs on an XFX 5870 XT at stock frequencies on some games. I had to downclock the memory to be able to play.
XFX support is kind on answering, but it keeps going they are working with ATi to look into the problem. It's been weeks.
I don't know if suggest you on buying this card...
You were lucky you only need to downclock by 50.
First I had to downclock all way to left, to the lowest values of 600/900 from stock 865/1300. Than I raised gpu step by step, finally the memory, after that I found that above 1175 GSODs occurred, so I could even keep 900 for gpu but any value...
Owning XFX 5870 XT.
Getting GSODs mostly on STALKER CoP after 5-10 minutes of play.
Fixed them by finding the optimal memory frequency of 1175. Now running my card at 865(stock)/1175(-125 from stock).
I don't know if I ever will RMA it.