Everything is posted above Steve

But here is a picture of the new memory and all looks identical!! Only thing that stands out to me is the different manufacturing dates. 

What I would try is. 

1. Use your old memory at 

CPU0 DIMM 2,4,3,1. Put New memory at CPU0 DIMM 5, 6
CPU1 DIMM 1,3,4,2. Put New memory at CPU1 DIMM 5, 6. See if that will work. 

If that still doesn't work. somehow the memory can't work as 6 stick per cpu combo. then I'll

2. still put Old memory at

CPU0 DIMM 2,4,3,1.

CPU1 DIMM 1,3,4,2.

but new memory at CPU0 7, 8. CPU1 7, 8 using different memory channel. 

If that doesn't work then I'll test new 4pc alone to see if anything is faulty or you'll just have to get 6pc set for it. 

Steve

Did you check if the memory voltage or timings need to be manually adjusted in the BIOS? I’ve heard that sometimes mixing memory from different manufacturing dates can cause instability, even if the specs are the same. Also, did you try lowering the frequency, like down to 2666MHz, to see if that helps?