Woohoo - got my starter kit out of billing-address limbo!
Aaand...
Hashrate 1hr 34665 Mh/s
At the pool!!
38W at the wall on 120V, which seems pretty good given how lightly I'm loading the PS (Corsair TX750).
I have some tips to improve performance on the software side that I'm collecting as I roll them out here;
I've got my pi's load average down to 0.10 and total CPU utilization at ~5% with only two shares rejected in the last hour.
How did you get get up so high for 25Gh/s starter kit?
That's probably a fluctuation on the high side. The nature of Poisson processes means there's uncertainty equal to 2x the square root of the number of shares returned (at the 95% confidence level). That was 24480 diff1 shares at difficulty 32, so 765 diff32 shares; 2*sqrt(765) = 55, so I should report the rate as 34500 +/- 2500.
But, more to your point, pencil mod to achieve 0.74Vdd at the lowest voltage chip plus heatsink on back of board under regulator thermal vias. Stratum proxies running on external (fast) host; chainminer recompiled with
-Ofast -march=armv6zk -mfloat-abi=hard -mfpu=vfp -fno-strict-aliasing
instead of the default optimization flags. No manual chip tuning at this point. Estimate ~80% of the increase is due to the Vdd change, but I'm not going to slow things down to take better measurements
I will note that if this were achievable on all 16 cards the full kit would be >550GH/s!
