one of my elec circuits are at it's limit, so i downclocked further... getting 3.6Mh/watt
rig: gd70 with Seasonic 750's, phenum 4core, 4g ram
clocks: 800/650/887volts. (cgminer displays volts improperly)
rig is pulling 660 watts at the wall
cgminer version 2.3.6 - Started: [August 11, 2012, 9:02 pm] Rig:miner19
(5s):2385.78 (avg): 2381.94 Mh/s | H: 87.6 Q:17589 A:31314 R:717 HW:0 E:?% U:32.14/m
TQ:? ST:35 SS:? DW:2399 NB:108 LW:90454 GF:8 RF:31
Connected to http://gpumax.com:8332 with LP as user ?
GPU 0: 73.0C 2857RPM 47% 120 | 476.9/476.2Mh/s | 99% | 800Mhz 650Mhz 1.17V A:6283 R:151 HW:0 U:6.45/m I: 9
GPU 1: 70.0C 1081RPM 0% 70 | 477.3/476.5Mh/s | 99% | 800Mhz 650Mhz 1.17V A:6285 R:134 HW:0 U:6.45/m I: 9
GPU 2: 71.0C 1056RPM 0% 71 | 477.4/476.5Mh/s | 99% | 800Mhz 650Mhz 1.17V A:6292 R:135 HW:0 U:6.46/m I: 9
GPU 3: 70.0C 1097RPM 0% 70 | 477.0/476.1Mh/s | 99% | 800Mhz 650Mhz 1.17V A:6270 R:150 HW:0 U:6.44/m I: 9
GPU 4: 72.0C 1284RPM 35% 107 | 477.3/476.5Mh/s | 99% | 800Mhz 650Mhz 1.17V A:6184 R:147 HW:0 U:6.35/m I: 9
Gah, I hate you. 750w+ for 2x 6870's and 2x6970 getting 1340mh/s. (yes, its currently profitable)
OK, time to figure this crap out. That rig is my biggest moneymaker, but also the most power-hungry.
I'll chime in more once I get my 7970 + 6950 mining tonight on a different rig.