I'm gonna buy a PC with this spec:
CPU - Intel Core i5 750
Case - Thermaltake SopranoRS 101
Motherboard - Gigabyte GAP55UD3L
HDD - Western Digital Caviar Black 500GB SATA II 32MB Buffer
Memory - Kingston 2048MB DDR3 1333MHz
GPU - Nvidia Geforce GTS 250 1GB
PSU - Hec Win+ 600W
Is there something that I can overclock?
BDW I bought the GPU already overclocked so for him it's irrelevant.