Sorry guys, I should explain better (had been at the damn thing all day and was tired when I posted).
My Son has an old (Q6600, running at 2.4, 4gb ram, W7 x64, Samsung 840 SSD, nothing else in the box) PC I thought would tide him over till Xmas, and in the meantime (his birthday) get him a better video card.
I also figured a better PSU and case with more room might be in order (R9 290 is huuuuuuge). He uses the PC for Youtube, Minecraft, Terraria and not much else at the moment but wants to max out his visuals with shaders, view distance etc, plus at some point he will switch to non block based gaming (I assume...)
Wiped the old drivers (HD6870 card in there), installed XFX R9 290 (used), get to windows, install new drivers, fire Google Chrome up and head to Youtube... Blue screen.
I bought two of these things, an XFX and an MSI TwinFrozr (which the seller had said was an RMA return and barely used). Both have Manufacturers warranty remaining I think. Both do the same thing. Get to Chrome, then it's a matter of time before BSOD.
Looked on the internet, lots of people have this 'A0000001' BSOD, apparently caused by 'atikmdag.sys'.
Before the AMD drivers (tried 14.4 and Beta 14.7) are installed they work fine as generic VGA cards on generic monitor. Youtube, Chrome, fine, multiple videos playing. Not tried gaming with it like that so might do. Anyway, put a driver in (latest 14.4 or Beta 14.7) and BSOD shortly after opening Chrome or sometimes at random.
Driver issue or hardware fault? Got me stumped. Before I put one in mine (as per sig) I need to get my sons's sorted. If all else fails I will try to return/rma these and give my son the GTX 660 out of my box, and I will make do with whatever I have lying around, or swap with his 6870.
Will also try the drivers that come with the card on the disc. Always figured later drivers=better but in this case, maybe not.