On another forum there has been a lot of people complaining that with their evga x58 board and gtx 600 series card the computer will NOT resume from s3 sleep mode. I myself am having the same issue. This seems to be a known issue since April but so far there is no fix. Not sure if this is only with evga x58 boards or all boards.
Posting this here to see if anyone else is experiencing this with the above combination?
If so I encourage you to let the maker of your hardware aware of this issue. Perhaps if enough complain there will be a fix.