I use Slush's pool almost solely, but the rewards has been far worse than expected always.
Before i didn't really care, just few Ghash/s worth for fun running.
Currently i have on Slush 1.77Ghash worth of capacity and the yield is 0.95BTC/day while expected is ~1.2BTC/day.
This has always been true of Slush's pool, and deepbit seems to be even far more worse.
All my systems are properly cooled, have good PSUs, only mild OC if any and efficiency (stales etc.) travels at around 97.8 to 99.2%.
I use Linuxcoin, and even after updating to latest Phoenix which increased hash rate ~7.5% i saw actually a decrease on reported hash rate @ Slush's pool, and it made absolutely no effect on yield.
Generally my GPUs are running under 100% utilization, somewhat below the average expected by the hardware comparison charts, except for some cards, ie. 6770s i'm running at 242Mhash/s average! (890Mhz, stock 850, temps ~65c, stock air cooler)
About to change to BAMT (Linuxcoin has always sucked, but it was most convenient to use last summer) and see if that changes things.
But anyone know why my returns are roughly 20-21% below the expected?
Direct Ghash/s comparison to pool total should yield 1.214BTC/day.
According to: http://www.alloscomp.com/bitcoin/calculator.php
should make 1.19BTC/day and after taking into account pool luck should still be 1.1186BTC/day.
Also someone mentioned that 1Ghash/s stays at around 4$ per day value on average over the long term, How the hell does one achieve that kind of results? :O