DDR5 HUDIMM simulation with ASUS BIOS shows nearly 50% bandwidth loss

[harlan4096]

Half the memory bus, half the bandwidth



HKEPC has published what appears to be the first hands-on performance test of DDR5 HUDIMM, a cut-down memory design that keeps only one 32-bit sub-channel instead of the two 32-bit sub-channels used by standard DDR5 UDIMM modules. The site says the test was carried out with ASUS support and used a BIOS that recognizes HUDIMM operation.

This is not a retail HUDIMM kit review. HKEPC says it simulated the format by masking one 32-bit sub-channel on a normal DDR5 DIMM with tape, then booting the system with HUDIMM-capable firmware. In the demo, the BIOS still identified the module as a 16GB G.Skill stick, but the information page showed 8GB effective capacity, while CPU-Z reportedly detected the memory as running in “1x 32-bit” mode.

Continue Reading...