Let's me go back.
So I was running i7 930, UD3R, and the 3x2GB when I first got the computer in 2010. Then changed/added the 8GB RAM in 2013, 2015 and 2016 each year 2 sticks and yes they are the same brand and model. Then I change the CPU to x5650 in 2016, I think is the same time I add the last pair of RAM. Everything work fine until a month or two ago after I blow out the dust and starting to use the AC in my room when it started to crash randomly. Reset everything to optimized, set voltage manually, set memory timing manually still crash. Did memtest on all 6x8GB, error. Tried each stick on DIMM0, NO error. Then tried DIMM2 and DIMM4, also NO error. Then tried DIMM0+1, 2+3, 4+5, also NO error. So I thought the memory controller on the CPU got degraded so badly and needed to replace, thus brought an x5660. Got the CPU and did the same memtest and NO error. Thought I solve the problem. Ran fine for a month, maybe a bit less, and starting to get random crashes again. Did memtest. Got error on DIMM2 and DIMM4
Canon T3i/600D | EF-S 18-55mm f/3.5-5.6 IS II Lens | EF-S 55-250mm f/4-5.6 IS II Lens | Tokina AT-X 116 PRO DX-II 11-16mm f/2.8 Lens | Sigma 50mm f/1.4 DG HSM Lens ART
YongNuo YN568EX | 2 x YN622C
Nikon FG | 50mm f/1.8 Series E