Below is the spec:-
MB: Supermicro H11SSL-i Rev 2.0 with BIOS 2.1 (Purchased from ebay. Seller from China)
CPU: 7401P (purchased as combo offer with MB)
RAM: Hynix 8 x 16GB DDR4-3200 ECC RDIMM (locally purchased - used)
HS: Noctua NH-U14S (purchased used from ebay)
Storage: 256GB SSD (Windows 10) and 512GB NVME drive (Ubuntu 20.04). Both cannibalized from previously sold xeon system.
Case: Fractal Design Meshify C mid tower. Cannibalized from sold xeon system.
PSU: Seasonic Focus 650W platinum. Cannibalized from sold xeon system.
All in all, I spent $1249 including shipping and taxes for the first four items above. I know the cpu is under-powered but still better than my xeon E5-2697v3 system that I sold off recently. The funding came primarily from the sold xeon sytem and one gimped Radeon VII card to a miner in [H] forum.
The 64 core epyc rome is still super-expensive. I'm still looking around but if anyone has a decent price, please let me know. Since this is a 1P system, 64 core would be ideal but if the 32 core price is so good, I might bite.
No plan on adding gpus as I only have 650W. There are plenty of pcie lanes thare are not populated.
Interestingly enough, I can overclock this system (only tested at 3.2GHz) using a program called zenstates but don't like the power consumption and efficiency. Oh, love the IPMI/iKVM that you can boot into the BIOS and decide if I want to boot up in Windows or Ubuntu without physically attaching a monitor, keyboard and mouse.
All the other parts are more or less what I would have used if I were setting this machine up. I have a few systems in Meshify C cases, used the NH-U14s on my EPYC build, and have Seasonic Focus PSU's in most of my builds. Quality components all around.
Unfortunately I do not know of a good source for inexpensive EPYC Rome processors. I would really like to put together at least one more dual socket 256 thread machine and then sell/retire my lower thread count machines, but like you said the processors are still super expensive. If I happen to find a source though I'll let you know.
Depending on the PCIE lanes width support, you have these options: