It really depends on whether or not you have an optical drive. If you don't have an optical drive, you're fine. If you do, I wouldn't do it. Newegg's PSU wattage calculator recommends over 500 if you have a DVD-RW, or a Blu-Ray drive. If not, they recommend about 475. And as Outlander has pointed out, do not overclock anything.
It does have a DVD RW drive which ill probably never use so ill leave it disconnected until im upgrading my PSU, I assume disconnecting the DVD drive will not affect anything else on my pc is this correct?