Reply 20 of 33, by TrashPanda
Alistar1776 wrote on 2022-11-22, 23:34:TrashPanda wrote on 2022-11-22, 23:06:Yeah the 3XXX Xeons work fine in pretty much all 775 boards as they cannot be used for SMP, weirdly the 3XXX Xeons used the 775 socket format rather than the later 771 format.
5XXX Xeons require sticker mods, socket/notch mods and a bios mod and will not work at all in X38 or X48 boards due to having the SMP bit set on the CPU which these chipsets do not support. I wonder if there is a SMP pad on the CPU that can be shorted or sticker modded to disable chipset detection of that SMP bit, would be nice to use 5XXX Xeons on X48. (The X5470 would be a fucking overclocking beast on X48)
What is SMP?
Symmetric Multi-Processor, or in simple terms more than one CPU in the system, 3XXX series Xeons didn't have the capability to run more than one cpu in the system but 5XXX Xeons did and it was this SMP flag on the CPU that X38/48 is incompatible with.