i just upgraded from a 330 with the same amps on the 12volt.
I was having random reboots and i thought my PSU was why btu it turned out i needed to upgrade my damn chipset drivers because i didnt do it on the last reformat.
But with this new PSU im 25% overclocked and stable. you are on a decent OC right now, if your stable great and maybe just leave it at that because you might be at the limit for your system, now a PSU could get you more overclock and isnt a bad thing to upgrade if you plan on upgrading video card or just your system in general in the future. 330 prolly wont cut it for a new video card and whatnot so if it doesnt improove the overclock you are achieving it would still be worth it in the future IF you plan on upgrading