My System :
M/B : ASUS ROG RAMPAGE VI EXTREME
CPU : 7940X
RAM : Samsung 32GB ECC/REG RDIMM x 8
I used old bios (ver 1004) to use ECC/REG RAM on x299 system ( Related Info : https://forums.tomshardware.com/threads/x299-512-ecc-r-dimm.3268738/ )
and I'm suffering same phenomenon like in the comment of above link. Only 185GB of ram is available to use.
256GB of ram is recognized in BIOS/SYSTEM/CPUID etc... but windows says only 185GB of ram is usable.
Belows are related screenshots.
Any ideas to use all of the memory?