Same setup different hashrate.
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Have setup 2 rigs that run pretty good, but there is always room for more and this is what.
Exactly same setup.
2 X R9 290 ( same make and model ).
850 W PSU
16 GB RAMOnly thing different is that one rig has an old Asus PK5 Motherboard and the other rig has a New ASUS Saberttoth Motherboard.
Same software setup and same configuration of CG miner.
The rig with the old mob is mining at 900 x 2 steady with WU at 1690 - 1710 k hash.
The other rig is going at 850 x 2 steady with WU at 1590 - 1610 k hash.
On both rigs power is higher in one card than the other, 1.170 and second gpu close to 1.050.
Temp is sub 80 on both rigs.
A motherboard issue ?
Not a big issue but would be great to get that extra 80 90 k hash out of the rig.
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I have the same issue but I am not too concerned about it. The motherboard should not be a problem as mine was brand new…It could just be the way the thermal paste was applied during manufacturing…