To be clear, I'm running an Intel build, with i5-4690k, cougar rs 750w, msi z97 guard pro, g.skill ripjaws 8gb ram. And by professionally tested, i mean i had it returned to reseller, where they took the motherboard and put in into their test system, and apparently it worked perfectly. And i couldn't give them my cpu, because i got the mobo with an online reseller.
And i tested the ram by performing a systematic deconstruction of my system, starting with my drives, and finishing with only cpu, mobo and power supply connected. This would have given me an error code different to the one i was getting if it was the ram, i looked this up online beforehand. I also looked online to find a flashing pattern (of the motherboard led) for cpu failure, but like i said previously, the patterned did not change during the deconstruction, which would have indicated where the faulty part was. It also did not present with a cpu error pattern, which would have triggered immediately if it had been the cpu. And yes, i did check for the specific model of motherboard, as it tells you these things in the manual.
Also, if it was an error in getting power to the cpu, and if at the same time the motherboard was functioning as it should, then it would give the associated error pattern as if there was a hardware failure inside the cpu itself.