after testing with a watt tester and amps several script algo including Folding@home, this what i find out:
Based on 6 x GPU cards (R9 280x) on one motherboard:
Primecoin (XPM algo) - Miner: Claymore - Watts: 1870 watts - Ampers: 6.10 amps
Folding@home algo - Miner: F@H - Watts: 1243 watts - Ampers: 5.4 - 6.1
X11 Scrypt algo - Miner: SGMINER - Watts: 1010 watts - Ampers: 4.5 - 5.5
Remember, this numbers are based on 6 x GPU cards:
Test equipment
4 x R9 280x Sapphire TOXIC
2 x R9 280x MSI Gamer OC
2 x PSU: 1)1200 watts PSU & 2) 1000 watts PSU
I hope this info will be usefull to others
Some clock speeds and voltages should be added !
I am getting much lower numbers with 1040Mhz @ 0.956 - 0.986V:
4 x R9 280x Rig -
Primecoin - Primecoin (XPM algo) - Miner: Claymore - Watts: ~800 watts (1200w for 6 x 280x)
Folding@home algo - Miner: F@H - Watts: ~550 watts (775w for 6 x 280x)
X11 Scrypt algo - Miner: SGMINER - Watts: ~500 watts (750w for 6 x 280x)