Re: Black Arrow announces 28nm 100Ghash Bitcoin ASIC from $1.49/Ghash

Blackarrow asking customers if they will accept delay for switch to 20nm;

http://ecointalk.net/topic/289-20nm-or-28nm/

I hope they are not seriously considering these. Any kind of delays (2-3 months) would suck

its allot better then having you hardware for 2-3 months, then it becomes obsolete

I disagree. It's better to have hardware that earns more BTC over its lifetime than hardware that remains profitable longer.

with the rate the difficulty is rising, i'm afraid you are wrong..

since 20nm will at best deliver about 2 or 3 months after the 28nm (and probably will be delayed) the 20nm should have already made it's ROI.

rule of thumb with miners:

If it can't have a ROI of 60 days it's not worth buying.

Did you mean to say that the 28nm would have already ROI'd? If so, then I agree. The 28nm version will make many more BTC over its shorter lifetime than a 20nm equivalent 2-3 months later. The high rate of difficulty increase is the key factor here.