How are you installing OSes----from what source? DVD drive? pendrive....all from same source? is what I'm getting at. Have you tried changing SATA cables. Are you using Intel SATA ports?
Do you have any other DDR3 RAM. When you try one stick try on red slot near right CPU and then far right red slot too and far left see if any slots are dodgy...
Have you tried removing CPU from socket and very carefully checking pins in socket for alignment?
Use the BIOS flashback method in this post to reflash BIOS and yes, use 3504 for now...later 4xxx BIOS are a bit more IB-E centric and change some RAM settings etc. which your GTs might not like.
Make sure SSD firmwares are up to date and secure erase them
Clear CMOS between tests...