gigabyte p55a-ud4p Need some help OC

Hey, Im new here, and really new to the OC scene. Instead of tapping into this resource of OC hardware, I would just go spend more money for the latest and greatest. That freedom has ended. I have the gigabyte p55a-ud4p and i running a 680watt PS and have the: Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor. I also replaced stock cooler with:
EROtherm CORE92 Socket 1156/1366 HDT Cooler
Item #: N82E16835887023
I am also running 8gb:
G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ.
For graphics I just bought:
EVGA SuperClocked 01G-P3-1563-AR GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support ...
Item #: N82E16814130610.

SO like I said, I am new but with these components I should have any trouble getting top performance on a game like SC2, should I?

ANy and all advice I would appreciate, but I figured I would start with the motherboard and OC from there. Thanks again.

Welcome!

You should be fine on SC2.

As far as overclocking, check out the guide in my signature to get you started!