Pretty good performance. I'm at 10,000 keys/s, pretty slow, so I will get nowhere for values > #40 without trying to improve code or coding for GPU.
Anyhow, I think even with GPU we won't go too far...
Do you know anything about who created this 32 BTC puzzle?
A GPU cracker would take at most ~a year for solving the next 2
51 address at 35,000,000 keys/s. I guess it will be cracked too in future, but for fun and not for money.
I don't know who made this pizzle.