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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.

Screenshot 1 Screenshot 2

Any ideas to use all of the memory?

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  • Did you check your page-file settings? – Niall Jones Jul 12 at 8:08
  • Please see this link. It has many different solutions that could help you. – Niall Jones Jul 12 at 8:12
  • Check your motherboard manual and specifications as well as your CPU specs. I don't see how your Tom's Hardware link would be related as it's about a different manufacturer and board? See this for some information about hardware reserved RAM. The short answer would be to use a supported configuration. – Seth Jul 12 at 9:03
  • I cannot rely on official manual because using ECC/REG ram on i9 platform is not officially supported. I referenced the link because the user is also using same x299 with same RDIMM configuration and gives same amount of ram usable. – Sunkyue Jul 12 at 11:44

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