15min with a sharpie, a drill and tap says any 2U case fits as many ITX systems as you can physically fit in the space. Then probably 2-3 hours working out the wiring so the redundant psu’s power them all.

Why bother with multiple motherboards when you can just have 1 and many VM’s?

Some Dell servers require HDD/SSDs with Dell firmware locking you to their ecosystem. No idea about workarounds but I assume they exist when the factory warranty doesn’t matter anymore.

Dell should tell you in the specs if you input the service tag to their service tag finder.

Where’s the rest of the RAM slots? Should have 8 per CPU, not 8 total.

Where’s the rest of the x16 slots? 2x Xeon’s for that gen have 80 total lanes, I only see 2 x16 slots which you can use just fine with 1 CPU.

My 2687w’s score the same R15/R20/R23 multi-core as my single 5900x. Kinda sad really but with 256gb RAM and either 4x 12gbps SAS drives or 8 6gbps SATA drives and up to 4 GPU’s it’s still a beast, abit a bit power hungry.

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As for the AIO’s…you want 2 dedicated headers for the pump that you can set to 100% then put the curves on the radiator mounted fans. As the other poster suggested I’d try to get both radiators on top rather than the current setup, that way you’ll still have intake/exhaust fans to try to keep the rest of the system cool.