Why won't my new build stop crashing

Flames840

Distinguished
Nov 9, 2011
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So I put together a new system.

Biostar ta870+
Amd Phenom ll x6 3.2ghz 1090t
Crucial ballistix tracer 1600 w/ leds
Seagate barracuda 2tb 5900rpm
His radeon 4760 1gb ddr3
Kingwin lazer 850w

so the problem is it doesn't want to stay running. It will run for an undetermined amount of time then crashes. Sometimes (randomly) it will reboot just fine. But sometimes doesn't even start just keeps mem testing over and over. Then when it does finally start cmos resets itself. I cannot figure ot why it won't stay running. Stock settings recognise the ram as 800 and the clocks are all wrong. I am not overclocking the cpu at all. Six cores at 3.2ghz is fast enough. Temps are low cpu never get over 40c with the liquid cooling setup. What am I missing here?