I have googled for "G41M-VS3 overclock", and found some results on Toms Hardware in german. Using 1333-Ram should be possible, but reported not to work with the q6600 (or any other 1066 CPU). They used it with 1333-CPUs (i.e. Q9650). Going beyond 333x4 was possible, but not beyond 344x4 (so max 1377).
Most people describe the board as "cheap, not having the ressources for overclocking).
Best hit:
https://forum.lowyat.net/topic/2799607/all
My own experiments/experience with overlocking my q6600 on ASRock boards was just terrible. The q6600 was going fine to 2.7 GHz without problems on Gigabyte-boards, but on my ASRock-boards, not a little bit. I only have good experience with overclocking on ASRock boards since P67 chipsets.
Sorry to be...