hey. i'll probably post this again to mining, once my account stops being noobified, and if i don't get the answer here,
but. i've just built my first 6 gpu rig, running with 3 radeon 5970s.
but, if i run one card, i get what i expect to be normal hash rates in the 350 range per gpu.
run two, all four gpus drop to around 320 ish.
run all three and i'm at around 295, as evidenced by the following image.
is this... normal?
i only have a dual core in the system, am running windows 7 with 4gb of ram.
all of the cards are overclocked to 800, with a 300 memory clock rate.
using guiminer with phoenix, and the newest phatk kernel.
in my single card rigs i overclock my 5970s to a safe 820/300,
but the third card in the 3 card mining rig has problems when i do that, so i've found 800 to be a stable number.
am i wrong in expecting that each gpu should produce 350 m/h? or is this typical?
any help would be greatly appreciated.
let me know if you need more information.