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Asus sabertooth 990fx/m5a97 le and fx-8350 System hard freezes underload need help

Level 7
So, I decided to build my first pc last December. I bought a fx-8350, R9 280x, M5a97 Le r 2.0 motherboard , corsair vengeance 2x4gb memory (CMZ8GX3M2A1600C9), 1tb western digital HDD, a corsair cx 750w power supply and a windows 8.1 oem license.

After installing everything and updating every drivers for the first time, my pc would already freeze when it was under load. It could load the game without any problems. It could play any games on high settings , but after 2 to 20 mins of gaming, it pc would hard freeze and Ii had to force reset it.
After re-installing windows several times and seeing that It wasn't fixing the problem, I went to a computer shop to get my pc analyzed. They tested each components without find any problems except that my psu was making a strange sound. So I RMA it , along with my motherboard. I replaced both with a Sabertooth 990fx r2.0 and a Supernova 750G1 psu. And I also decided to change my HHD for a SSD and bought a hyper 212 evo cooler for my cpu , plus 4 fans.

So, after re-installing everything again, I was disappointed to see that my system would still hard freeze after a number of minutes.

I also noticed that when i shutdown my pc , half of the time it freezes at "shutting down", it also do that when im restarting it , but a lot more often, about 4 times out of 5.

I really don't know what to do, I tried adding voltage to gpu with amd overdrive, it is set to +20%. It did nothing.

Tried to run memtest86 , 13 hours , 7 passes and no errors

Tried to add voltage to my DRAM , it did nothing.

Could it be a bad copy of windows ?

I can run a benchmark or a stress test on my Gpu for several hours without any problems. But as soon as I stress my whole system, everything freeze with no BSOD.

Prime 95 made my pc freeze and showed some error message. It is the only program that it have had blue screens with.

Please help me, i really don't know what to do.

Level 10
Bluescreen when running Prime does sound like the CPU is not stable. With the M5A97 LE R2.0 I would have said VRMs are overheating but that should not be an issue on the Sabertooth. What are the CPU temps under load?

PC freezing without a bluescreen could also point towards an unstable GPU...
Could you try downclocking the CPU/GPU and run Prime + some games again?

Level 7
Are you overclocking. Most of the time a screen lock up means not enough vcore for the cpu. A blue screen means memory problem ie...not enough ram voltage or CPU/NB voltage. This is not always the case as there are other variables, but a good place to start checking. Run your CPU/NB at stock...2200 mhz, run your ram at 1333 mhz, then check your system again. Also disable c6 state, and set ECC to disabled under memory options in the bios.
Chris...Have a nice day.