This is my current pcs specs CPU:* Intel Core i7 2600K Operating System:* Microsoft® Windows 7 Home Premium 64-bit Motherboard:* Asus P8Z68-V Memory:* 8GB DDR3 1333mhz (2x 4GB) Hard Drives:* 1TB S-ATAII 3.0Gb/s Optical Drive:* 22x DVD±RW DL S-ATA Graphics card:* NVIDIA GeForce GTX 560 Ti 1GB Sound card:* Onboard 7.1 Audio Case:* Corsair Carbide 500R White PSU:* 500w Xigmatek What should I look to upgrade first, also does anyone have any info on how to overclock the CPU?