Intel Core Ultra 5 250K Plus or Ryzen 7 9700X for a Home Server?

The LGA1851 upgrade concern is less significant for a server than it would be for a gaming desktop. Replacing a CPU every few years usually offers only a modest improvement, while the board and memory are often more important. I’d choose the 250K Plus if you expect multiple concurrent services or media streaming, and the 9700X if it comes with a noticeably cheaper or better motherboard.

The Core Ultra 5 250K Plus is probably the more versatile server choice. It has more total cores, generally strong idle efficiency, and Intel’s integrated graphics with Quick Sync can be useful if you later run Plex or Jellyfin and need hardware transcoding. The extra cores also give you more room for several services running at once.

The Ryzen platform can support unbuffered ECC memory on some compatible motherboards and with the right modules, though that is a fairly minor advantage here. Its integrated graphics are also usable, but Intel generally has the stronger media-encoding feature set, especially if AV1 hardware encoding could matter later. Since the CPUs are similarly priced, Intel is the safer all-purpose pick unless AM5 upgradeability or full-performance cores are especially important to you.

For this workload, 16GB of RAM is likely to become the bottleneck before either CPU does. Modded Minecraft and multiple game servers can consume memory quickly, so I’d prioritize getting 32GB or more if you plan to host several instances. Both processors are fast enough for a small home server; choose based on total platform price, power use, and whether you want Quick Sync.

The Ryzen 7 9700X still has some advantages: all of its cores are full-performance cores, which avoids any unusual scheduler behavior, and AM5 should have more upgrade options. It can also be more efficient during sustained heavy workloads. For only one or two game servers, its strong performance cores should be more than enough, so the Intel advantages may not matter much.