Brian1965,
Memory scores on Passmark are a bit confusing as the memory marks can be much higher on a 16GB system than one having 96GB and so on- all over the map. I'd gotten in the habit over the years of completing channels , if possible use all the same model of RAM, and on dual systems have the same amount of RAM for CPU 1 and CPU2.
When I bought the z620, it had a single 8GB DDR3 1333 ECC module. The memory performance was very poor with one module. There was then the choice as to use 1600 or 1866, but as I was robbing 4X 2GB from my other z420 (E5-1620 / 24GB / Quadro 4000, Samsung 840 / WD Black 1TB) As that was 1600 as are the E5 2590's, 1600 it was. I bought 4X 8GB Kingston. At the moment I have 2X 8GB + 2X 2GB on the main board and the same on the 2nd CPU riser so they're balanced at 20GB each and at least on on the main board there is CH1 with all slots filled and all slots are filled on the riser. When everything else is done, I'll make it 32GB and 32GB.
The situation with the Telsa M2090 in the z620 is intriguing as it should be throwing it's CUDA cores at the work. Your Passamark CPU mark is well above the average of 18606 for dual E5-2670's. I certainly don't understand the rendering being slower. Solidworks has the absolutely finest multithreaded rendeirng anywhere- fully scalar, - all cores invited- whereas Adobe graphics rendering peaks at about 5-7 Cores and Premiere will decline on dual CPU's. I've never used a Maximus setup, but I'm wondering if there are Maximus settings that could refine the configuration.
The disk score of 8112 for the SM951 AHCI in the z620 is interesting too as I had 11559 in the z420 and 11265 is average. When you say "Syba SATAIII card" is that a PCIe RAID controller? Curiouser,..
Query: Oh, I have a question for you or anyone else that might know. I have the second CPU assembly all ready to go both the E5-2690 and RAM. However, I do not have the rear panel "riser guide" that supports the left side (facing) of the riser assembly. See this part at 1:05-1:08 of
https://www.youtube.com/watch?v=sArSaUlcbiw
The right-hand bracket is present, but the bracket that replaces the uppermost PCIe slot cover on the rear panel is missing. Did your z620 have that guide bracket already or where did you find one? I'm going bonkers trying to find one of these. There so invisible I wonder if everyone uses them?
I'm sorry to say I find the HP replacement parts impossible. There should be an exploded diagram of the systems and labelled with links to parts number and ordering. The Parts Surfer is nearly useless as you have to know the part number in advance or sort though dozens of numbers and obscure referenced listings. My 4 previous HP systems have been new, but the first used one is difficult to upgrade as it requires parts. Perhaps I'm missing the magic instant part finder pages.
Sorry for such long posts.
Cheers,
BambiBoomZ