Re: 1GH/s, 20w, $700 (was $500) — Butterflylabs, is it for real? (Part 2)
I just ran some numbers for Inaba's Single @ https://eclipsemc.com/mw.php?key=196e69b1afe10927460b22a8de1c0d:
3:23pm CST: 65612 shares
12:08am CST: 70949 shares (8h45m later)
So the average hashrate during that 8h45m period was:
70949-65612 = 5337 shares in 31500 seconds (8h45m)
5337 shares * 2^32 hashes/share is 2.29e13 hashes
2.29e13 hashes / 31500s = 727Mhps
Not too bad, but still 13% lower than the advertised specs of 832Mhps.
3:23pm CST: 65612 shares
12:08am CST: 70949 shares (8h45m later)
So the average hashrate during that 8h45m period was:
70949-65612 = 5337 shares in 31500 seconds (8h45m)
5337 shares * 2^32 hashes/share is 2.29e13 hashes
2.29e13 hashes / 31500s = 727Mhps
Not too bad, but still 13% lower than the advertised specs of 832Mhps.
Here's another numbers run, for a 15 hour period to 15:06 CST today. Inaba mentioned there are some issues with his unit that are causing throttling.
@Inaba, have you had a chance to try the ufasoft miner to see if the unit behaves the same? It might provide clues on whether this is a cgminer-only issue, or if it is a fundamental issue with the unit.
@kano, you had mentioned earlier that you were doing some work on icarus support in cgminer; have you seen anything in the code that might suggest a reason for the observed throttling behavior?
start: 00:08CST, shares 70949
end: 15:06CST, shares 79630
So we have:
15:06 - 00:08 = 14h58m = 53880s
79630 - 70949 = 8681 shares
8681 shares * 2^32 hashes per share = 3.73e13 hashes
3.73e13 hashes / 53880s = 692Mhps
Thank you for these enlightening results.
Thus, it seems that the overclocked 7970 can get more than this unicorn BS.
I mean WTF
7970 | BFL
Cost : 550 | 599
Performance : 700 | 700
Warranty : 3 years | 6 month
Resale value : 50% | 0%
The ONLY advantage I see is the consumption of power but surely that is not worth it for some US guys that have 0.10 prices. Maybe this is for EU market but VAT and import duty kills that as well so it is LAME right now from the promised holy 1000 MHash/s, 20W, $500 figures ...
BFL deserves a medal for fail of the year.
Thermal throttling due to bad design FTW !