Newly built computer freezes at random times

[yoghurt131]

Hello, I got a newly built computer, I already had to RMA My videocard beacuse it was faulty. Now I have some problems again. The computer freezes with no error message, or BSOD. I have to restart it every time.

I already tried reinstalling all the neccesary drivers, even windows itself. (Tried with Windows 7 64Bit, and Windows 8.1 64Bit.)

I read that It's caused by either a bad PSU or a faulty motherboard.
But I sent it back for RMA once beacuse there were some real overheating on the northbridge, but they said it was normal.

How can I be sure of what is causing these freezings?

My computer:
Gigabyte 970A-DS3P MOBO
AMD FX 6300 CPU
FSP Hexa+ 500W PSU
Western Digital 1TB EZEX 64mb HDD
Gigabyte R7 260X OC edition 2GB GPU
2xKingston HyperX Savage 4GB 1866MhZ CL9 RAM

 

[jitpublisher]

What speed are you running your memory?

 

[yoghurt131]

Tried the two xmp profiles, 1866 MHz, and 1600mhz.

Currently It's on 1600mhz 9-9-9-24

 

[yoghurt131]

Nothing is overclocked.
Currently running memtest to see if the ram is the problem

 

[yoghurt131]

I may have found the cause of the problem. In the event log "The driver \Driver\AtiHDAudioService failed to load for the device HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1005\5&1084d83&0&0001."

I've uninstalled every audio related drivers, and the video drivers as well, and then I reinstalled the VGA driver first, with the HDMI driver excluded. Then I installed a newer Audio driver, and plugged out my old microphone.
Now the system runs fine I think, never been able to run it for over an hour, now it did.

Will post again If the freezing system is still going on.

 

[yoghurt131]

The problem is still going on, now not so frequent, the computer could run through 6 hours without a problem. And now it happened again. I still don't know what's happening. No error message in eventlog that can identify this, and no Bluescreen.