Are Xeons even possible on 200 chipsets?

BIOS/UEFI Modding BIOS Modding Guides and Problems
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first of all, it is possible.

all you need to do for running xeon e3 1200s v5 and v6 on 200s pch:

  1. dump your bios (full spi image). follow [Guide] Clean Dumped Intel Engine (CS)ME/(CS)TXE Regions with Data Initialization to decomp your bios image.
  2. save as a xml file, then edit it using a modern editor(i recommend notepad2), not notepad provided by windows.
    1. search HostCpuWriteAccess, HostCpuReadAccess, MeWriteAccess, MeReadAccess, GbeWriteAccess, GbeReadAccess, EcWriteAccess, EcReadAccess, change the value to 0xFFF.
    2. search “<Reserved value”, change the value to Yes.
  3. replace the “ME Region.bin” in decomp folder with the version i have provided Which ME version for Socket 1151 Xeon CPUs on 100-/200-Series? - #49 by dsanke
  4. load xml in fit, then build. flash outimage.bin.