System Freeze every 30 mins?

No clue what could be causing this
no blue screens just completely locks up and cant do anything have to hard reboot every time.
I dont think its overheating, not overclocked.
please help

Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W


SAPPHIRE FleX 100312FLEX Radeon HD 6950 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video

Western Digital Caviar Black WD5002AALX 500GB 7200 RPM SATA 6.0Gb/s 3.5"

CORSAIR Enthusiast Series CMPSU-650TX 650W ATX12V / EPS12V

G.SKILL Ripjaws Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)

ASUS P8Z68-V LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
4 answers Last reply Best Answer
More about system freeze mins
  1. Best answer
    remove your video card and run off of onboard graphics. see if it still locks up. if it does it may be overheating due to poor thermal paste application or it may be a bad ram module.
  2. I will give this a shot thank you
  3. I didnt bother with the video card, but we tried memtest and it crashed out, so after some trial and error, I think there are some bad sticks of RAM.
    Thanks for the help not sure why I didnt think of that sooner
  4. Best answer selected by easymark26.
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