pc freezes for a few seconds

gggaming22

Distinguished
Jul 1, 2011
3
0
18,510
hi

I build a pc about 2 years ago and its been doing but now i have a problem when i play games it always freezes for a few seconds and this happens about 20 times every hour.games that i play are wow,cod mw3,d3 and there not at max setting.

pc spec.
HAF 912
msi gtx 560 ti hawk
ASUS P8Z68-V/GEN3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
i5-2500K overclock to 4.5ghz
G.SKILL Ripjaws Series 8GB
Western Digital WD Blue 500g
CORSAIR Hydro Series H60
RAZER Naga Molten
win 7 64-bit
Logitech G510 Gaming Keyboard
HP 20' hd ready lcd monitor
Thermaltake TR2 600w