Why does the SC513G6M2NRE motherboard marked one PCIe slot [PCIe#4] and two MCIO port have no function while installed Intel non-R1S CPU?
Question:
Why does the SC513G6M2NRE motherboard marked one PCIe slot [PCIe#4]
and two MCIO port have no function while installed Intel non-R1S CPU?
Answer:
First, The R1S variant of the Intel Xeon 6 (P-core "Granite
Rapids") processors are a special, single-socket-only variant
that have their Ultra Path Interconnect (UPI) links repurposed to provide
significantly more PCIe lanes, while non-R1S CPUs are designed
for both single- and multi-socket configurations and use UPI link for
inter-socket communication.
SC513G6M2NRE uses UPI1 for PCIe 5.0 x16 slot#4. UPI2 for two MCIO
PCIe 5.0 x8 slots. (Yellow blocks). Both of these slots are only available
while installed Intel R1S processors. If installed with non-R1S processors,
then these slots are not functional.
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