Not sure, don't have a means to measure it. Should be pretty low tho, the highest voltage running card is 1.093, the rest are spread between 1.050 and 1.070 and quite cool even in the hot weather around, don't reach 70. My point is something waffle said: cranking intensity up gets you stales, because the card has no time to submit stuff, on the other hand, having the same speed achieved with lower intensity makes the shares gets submitted very fast, thus the low rejects. Also observation between the 2 configs - one makes even the mouse lag, the other - you can freely watch movies and can forget there is even mining going on.
Edit: just checked the other 3 rigs with 280x on them - the highest reject is 0.27%, the lowest - 0.07%
DM
Thanks for sharing your settings and experience - I've got a couple of questions (please forgive me if they're silly due to my newness to all this!):
1) I am using xubuntu and cgminer 3.7.2 - can I use this xi with this?
2) Given that the "power" of the graphics card is used for mining does the fact that you can play movies etc mean that you're missing out on some of the spare "power" for mining and hence there is more hash/effective work that your setup could be doing? I'm using "power" as I don't know what to talk about in terms of watts, hash to mean "processing power!
