You are a god among men.  Please post more on your config for each card please.  One of these days my 280x's are going to burn the house down at 1070/1500, but they throttle hard at most of the lower settings I've tried.

Any good undervolting guides for linux out there? My 280x's at stock voltage seem blazing hott running in mid 70. I've been very happy with all my undervolted cards running on windows.  


UPDATE:
The UPS and PSU on my rig with 6 x R9 270's LOVES you (800/900)! I drop under 200kh/s (about 6-7%), but its consuming 110+ LESS watts (about 12-13%). Haven't done the exact math yet, but I'm liking the numbers so far

Do you have any lesser underclocked settings I can try on my 280x's? They really drop kh/s hard at 800/900. I'm not surprised though because they really spaz on most other settings besides 1070/1500. I'm testing ok around 825/1000, but its not as great as I'd like.


UPDATE AGAIN:
Power Color 280x's like 1020/1250 i19 and will run around 680 which is godly compared to the old 1070/1500 i19 getting 720.
Temps are down a bit with 1.100V, cant wait to measure the wattage from the wall and try to push 1.075!