this guide is based on ticket 2108 where user has installed wrongly on our motherboard Tyan S8016AGM2NR which results in boot up bios posting error
following the official guide below
The MiTAC S8016AGM2NR motherboard (part of the TYAN S8016 series) supports DDR5 ECC UDIMM or non-ECC UDIMM memory at speeds up to 4800 MHz. It has 4 DIMM slots total, with a maximum capacity of 128GB (e.g., 4x 32GB modules). Memory must be compatible with the installed AMD Ryzen processor series —always verify compatibility on the TYAN or MiTAC website (tyan.com or mitaccomputing.com) for the latest qualified vendor list (QVL).
DIMM Slot Layout
The motherboard features four DIMM slots, labeled as follows (refer to your motherboard's silkscreen or the user manual's board diagram for exact positions):
Channel A: DIMM A0 and DIMM A1
Channel B: DIMM B0 and DIMM B1
Memory Population Guidelines
To ensure optimal performance and stability (e.g., dual-channel mode), populate the DIMMs in the following order based on the number of modules you're installing. Mixing ECC and non-ECC is not recommended; use matched pairs for best results.
1 DIMM: Install in DIMM B1 (often labeled as the primary slot for single-module configurations).
2 DIMMs: Install in DIMM A1 and DIMM B1 (enables dual-channel mode).
3 DIMMs: Not officially recommended for optimal performance—use even numbers if possible. If needed, populate DIMM A1, DIMM B1, and then DIMM A0.
4 DIMMs: Install in DIMM A1, DIMM A0, DIMM B1, and DIMM B0 (full population for maximum capacity).
Always install modules of the same type, speed, and capacity in paired channels (A and B) for dual-channel operation. If using unmatched sizes, the system may downclock or limit to single-channel mode.