Finally got it stable and hashing. It was brutal trying to get 4x5970 working in Linux. Sadly BAMT doesn't work (no dice for 8 GPU in 32bit kernel). I tried xubuntu but hosed something up installing SDK 2.1. Tried to restore from an image I made and it wouldn't boot. Ended up grabbing LinuxCoin (x64) and dropping in cgminer. I don't like it but it works for now.
cgminer version 2.3.1 - Started: [2012-02-28 12:30:03]
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(5s):2935.9 (avg):2952.6 Mh/s | Q:11590 A:3272 R:57 HW:0 E:28% U:15.06/m
TQ: 8 ST: 9 SS: 26 DW: 1950 NB: 17 LW: 15248 GF: 0 RF: 0
Connected to http://192.168.0.189:9332 with LP as user user
Block: 000007200ebc4183c7cefd4ed93eea81... Started: [16:04:46]
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[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
GPU 0: 52.0C 960RPM | 378.0/378.7Mh/s | A:445 R: 7 HW:0 U: 2.05/m I: 8
GPU 1: 52.5C 960RPM | 378.0/378.7Mh/s | A:399 R:10 HW:0 U: 1.84/m I: 8
GPU 2: 49.0C 960RPM | 378.1/378.7Mh/s | A:431 R: 4 HW:0 U: 1.98/m I: 8
GPU 3: 54.0C 960RPM | 378.0/378.7Mh/s | A:403 R: 3 HW:0 U: 1.85/m I: 8
GPU 4: 59.0C 960RPM | 352.8/353.3Mh/s | A:396 R:10 HW:0 U: 1.82/m I: 8
GPU 5: 58.0C 960RPM | 378.0/378.6Mh/s | A:407 R: 9 HW:0 U: 1.87/m I: 8
GPU 6: 55.0C 960RPM | 378.1/378.6Mh/s | A:413 R: 8 HW:0 U: 1.90/m I: 8
GPU 7: 53.5C 960RPM | 327.8/328.2Mh/s | A:378 R: 6 HW:0 U: 1.74/m I: 8
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Clocks are somewhat conservative but it is running @ ~3GH/s and pulling 1112W at the wall (120V). Once it is stable it will move to the 240V PDU so it should be 20-25W less there. One of the eight cores wouldn't clock to 835 (went sick 0Mh/s instantly) since I was tired I just left it @ 750 Mhz for right now. It is pointed at p2pool which makes share count, U, etc "weird" due to dynamic share difficulty.
Total System Load: 1112W
Total System Hashing Rate: :2.95 GH/s
System efficiency: 2.67 MH/W
Measured (not calculated) no-GPU (not even installed in rig) system idle: 190W
GPU AC load: 230W ea
GPU DC load: ~200W ea
Total System thermal load on water loop: 800W
GPU efficiency: 3.21 MH/W.
On edit: old pic removed (better pics below)
Note:
I don't have 30GH/s the figure comes from the potential. 3GH/s per 4U. 45U in a rack. 1U for switch, 2U for PDUs, 2U for "watchdog" server leaves enough space for 10 4U rigs.
