Hi,
one man is offering big money to break btc wallet password, he says he forgot it.

he tried rubby script and his pc is not doing it well, so, I was thinking to advise him to rent server for 260 bucks:
CPU Intel Xeon E5-2650v2, Cores/Threads 8/16t (the best processor)
with RAM 128 GB

and then I was thinking what is the best method to attack wallet password... I suppose it is bruteforce attack.

what software is the best for brute-force attacks if wallet is uploaded to debian server? he is from english speaking country, so, I suppose english dictionary for bruteforce would be good option.

cpu or ram is important or not? servers usually don't have graphic card, so, I suppose attack can be made with processor power but server can be cheaper if RAM is not important. it is possible to get 2x e5-2650 instead of big memory, maybe it would be better?

and what do you think, one month of running attack would break password or not?