In effect, No. The computing power required to crack SHA-512 is infinitesimal compared to that for, say, bcrypt. However, modern crypt() implementations support multiple rounds just like bcrypt and that would make it significantly more difficult (time-wise) to crack. But then again SHA-512 is already being replaced due to some potential flaws found, so.... shrug

Kind of pointless to crack your password, though. I mean, it's not like you use the same one for more than one account.