On 16/12/2020 22:34, Mark Knecht wrote:


On Wed, Dec 16, 2020 at 3:29 PM Mark Knecht <markkne...@gmail.com <mailto:markkne...@gmail.com>> wrote:
 >
 >
 >
> On Wed, Dec 16, 2020 at 3:22 PM <the...@sys-concept.com <mailto:the...@sys-concept.com>> wrote:
 >>
 >> I run Memtest86 on my old box and it completed 1pass without any errors.
 >> Memtest86 reports 16G memory
 >>
 >> When I boot Gentoo it shows only 3282Mb
 >> free -m
 >>               total        used        free      shared  buff/cache
 >> available
 >> Mem:           3282         125        2475           7         680
 >>   3033
 >>
 >> Is it a motherboard? How to test it?
 >>
 >
 > Start with
 >
 > cat /proc/meminfo


Or lshw and look for the DIMM modules themselves

Or is this a 32-bit system WITHOUT extended memory support?

I don't properly understand it, but with a 32-bit system the kernel uses 1GB of memory and user-space uses the other 3GB. Extended memory support means each process can have its own 3GB space which enables you to use all available memory, but without it I think the entire system is stuck in the first 4GB.

Cheers,
Wol

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