DRAM Detective · Case File 0.2
The DIMM's ID Card
The BIOS reads the SPD — 1024 bytes of "who am I" — before it does anything else.
Let me read this DIMM's ID card…
SPD
BIOS reads via
SMBus
· address
0x50
DIMM ID Card — 1024 bytes
Module Type
CSODIMM
Byte 3
Density
16 GB (1 rank ×16 Gb ×8)
Byte 4
Max Speed
6410 MT/s
Byte 20–21
Timings
CL-52 · tRCD-52 · tRP-52
Byte 30–37
Vendor
SK Hynix (0x80AD)
Byte 512–513
Part Number
HMCG78AHBVA312N
Byte 521–550
Before you interrogate a DIMM,
read its ID card.
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