c20
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Posts posted by c20
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54 minutes ago, Fiery said:
Sadly, most 2-way and 4-way server motherboards use a SMBus mux to handle the SPD for more than 8 DIMM slots. Such muxes are proprietary and not documented at all,...
Thank you for your reply.
Finally I've got an explanation, even if there isn't any solution to expect.
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I’ve recently acquired a Lenovo ThinkStation C20 (4263) system (Intel Tylersburg 5520).
The dual-processor mainboard is equipped with six identical 4 GB RAM-Modules.
The OS w10 pro x64 (10.0.15063.413 (Win10 RS2)) indicates 24 GB of Memory.
AIDA64 indicates 24 GB of Memory in the Memory Tab, but the SPD information lists 12 GB (3 of 6 RAM-modules) only.
May I ask if this is a bug or a feature?
SPD information incomplete, Lenovo Thinkstation C20 Dual-Processor
in Bug reports
Posted
The 2 groups of memory slots are assigned to a single CPU each. Currently I presume that only the SPD of the 1st CPU is recognized.
Are you sure this is really a Lenovo issue or might it be a limitation of the Intel Tylersburg 5520 chipset? If Lenovo had followed an Intel reference design the Information needed might already have been published by Intel.
Simpler question: Are there other 5520-dual-processor-mainboards, where AIDA64 is able to read all SPD Information (e.g. https://ark.intel.com/de/products/36599/Intel-Server-Board-S5520HC )?