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I've used 1.225v with no reservations whatsoever - highest I've seen is 1.35v, and I personally wouldn't get nervous until I crossed 1.3v; but that's just me.
If memory serves me correct, stock voltage for a 5870 is 1.15v.
Although do keep in mind that you've got a dual GPU card that will create much more heat and require more powwa too. But I still wouldn't be afraid to at least try 5870 voltage and maybe a bit higher if the temps remain at acceptable levels.
stock vid for 5970 is different from 5870, its lower. 5870 most of them are 1.162 unless they have the newer bios then its 1.175, XFX has a 5870 bios that is 1.125 but those are more rare.
With a sick card like that Sandy I would max her out on stock volts and be happy ! I almost got one but I ended up going the 5850 CF route.
Great thread Sandy, looking good so far!
Having the voltage up to 1.25 is a fine safe margin from what I've seen in the past. I'd probably hold off on 1.3v until you get a block on that sucker!
The reason: it's being released on consoles which means a $100 xbox will have to be able to run it. The freakin consoles are poisoning pc games.
Awesome, still looks HUGE, can you overclock a lot more than before now?
1 Ghz CORE!!!! lol