I'm going crazy ...
Today I setup 2 new fully identical rigs.
Both biostar btc-250 pro, core i5 6100, 12xGPU Zotac 1060, same power, ram, ssd, ...
Problem is one of them hashes much less than the other
Equihash
GPU0: 270 Sol/s GPU1: 271 Sol/s GPU2: 272 Sol/s GPU3: 271 Sol/s GPU4: 275 Sol/s GPU5: 274 Sol/s GPU6: 273 Sol/s GPU7: 267 Sol/s GPU8: 270 Sol/s GPU9: 273 Sol/s GPU10: 273 Sol/s GPU11: 277 Sol/s
Total speed: 3266 Sol/s
GPU0: 256 Sol/s GPU1: 261 Sol/s GPU2: 259 Sol/s GPU3: 268 Sol/s GPU4: 262 Sol/s GPU5: 259 Sol/s GPU6: 266 Sol/s GPU7: 262 Sol/s GPU8: 258 Sol/s GPU9: 271 Sol/s GPU10: 264 Sol/s GPU11: 260 Sol/s
Total speed: 3146 Sol/s
Ethahsh:
m 01:03:35|ethminer Mining on #a77fc9dd⦠: 229.11MH/s [A19+1:R0+0:F0]
m 01:03:58|ethminer Mining on #5355b83e⦠: 264.77MH/s [A98+0:R0+0:F0]
As you can see its not a one gpu fault but all gpus hashing less than the other

Swapped ssd drives to see if its a OS image problem, same problem on the lower rig
Any ideas ?