Hello,
I am looking to build a new home server/gaming rig and I had a few questions regarding my parts and software setup. I would appreciate any comments or thoughts on my build in general as well 
Background
I am a Machine Learning Engineer so I use my current computer for development but I additionally have a PCIE passthrough setup for both CUDA and gaming on Windows. I have a NixOS host a NixOS VM and a Windows 11 VM.
I’ve decided to upgrade from my Ryzen 3900x because I don’t have enough PCIE lanes to accommodate the number of NVME drives I would like and I figured I’d go all out.
Questions
Hardware
- I’m buying a watercooler for my server case. Since there is only one intake in a server chassis do I need to buy 3 more fans to have a push pull setup or is that overkill?
- I think the PSU I’m buying is overkill but I want to have sufficient overhead given the parts I’m using. What are the consequences of using a 1000va UPS with the power consumption requirements of my build? Will the UPS limit how much power is being drawn from it? Or will it simply not guarantee that it could provide backup in the event of a power failure? I would get a larger UPS but I’m not sure it’s worth it unless I move to a 20amp breaker which I can’t do.
- I’ve looked at different kits of ram and I just want 128GB of ECC registered. I’ve heard others on reddit and here recommend this kit but is there anything else I should be aware of when looking for a kit of RAM? I know Wendell explains that choosing RAM is not as simple as whether or not it’s compatible on paper.
- Given that I have a SAS drive with a U.2 interface is having that in addition to 2 Gen 5 NVME SSDs with another gen 4 NVME compatible with the number of available PCIE lanes?
New Parts
CPU Cooler
SilverStone Technology XE360-TR5 360mm All-in-One Liquid Cooler for AMD TR5 / SP6
https://www.amazon.com/dp/B0D7KYN5PP/
Case
SilverStone Technology RM44 4U Rackmount Server Chassis
https://www.amazon.com/dp/B0BFC8FZ8B/
PSU
Seasonic Prime TX-1600 | 1600W |80+ Titanium
https://www.amazon.com/dp/B0C571LRNB/
RAM
Kingston FURY Renegade Pro EXPO 128GB 6000MT/s DDR5 ECC Reg CL32 DIMM (Kit of 4) Memory Overclockable ECC registered DIMM- KF560R32RBEK4-128
https://www.amazon.com/dp/B0CN3BKQXX/
Motherboard
ASUS Pro WS TRX50-SAGE
CPU
AMD Ryzenâ„¢ Threadripperâ„¢ 7960X 24-Core, 48-Thread Processor
Storage x2
Crucial T700 2TB Gen5 NVMe M.2 SSD
https://www.amazon.com/dp/B0C3K7MTSY/
Old Parts Migrating Over
Host GPU
Radeon Pro WX 2100-2 GB
https://www.amazon.com/gp/product/B07P16V4DG
Passthrough GPU
GeForce RTX 3090 SUPRIM-X 24G
https://us.msi.com/Graphics-Card/GeForce-RTX-3090-SUPRIM-X-24G
NixOS VM Drive
Intel 2TB NVMe SAS SSD DC P4500 Series 2.5" Solid State Drive SSDPE2KX020T7K
Windows 11 VM Drive
I appreciate anyone who took the time to look at my build. I plan on updating this post when I purchase the parts in two weeks with build pictures.