Problems with new homebuilt computer, freezes.

[Sponed1337]

Hello, I've got some troubles with my new homebuilt computer. After using the computer for a while it freezes and then I need to turn off the computer by turning it off with the power switch. I got windows 7 Ultimate and I installed speedfan and core temp to check if the cpu was overheated and it seems like it gets hot fast even though everything seems to be allright. is it too little thermal compound ? I'm using the stock fan.

My pc specs is
Intel i7 4770 3.4 GHZ,
KVR16N11K2/16 16GB (8GB 2Rx8 1G x 64-Bit x 2 pcs.) PC3-12800 CL11 240-Pin DIMM Kit
Nvidia Geforce GTX 560
Gigabyte H87M-D3H motherboard
Corsair TX750

I appreciate any help I can get!

With kind regards, Ludwig.

 

[tiny voices]

What are the CPU temps UNDER LOAD?

Also, run memtest for 6+ passes to test for bad RAM. This often causes freezes.