I have released a faster binary of bitcrack. (A tool to bruteforce bitcoin private keys)
https://github.com/sp-hash/Bitcrack/releases/tag/sp-mod1Should be around +50% faster than the fastest opensource
The build require Compute 61 or newer (pascal). Please test. What hashrates are you getting?

Does it really work?
Ask again after this: there are keys with 10000 BTC in them.
Wouldn't be this same as stealing? :/
yes, unless the account is your own (and you lost the privkey for any reason).
...and it is statistically "impossible".