Linux not seeing Ram. But Windows does ?

area51_for_psx

area51_for_psx

area51_for_psx

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Guys am building a wee home server out of random parts. And was looking to try Linux as I am not confident with it.

Xeon E5-2650 v4
Board is Machinist X99 PR9-H (from A Express)
128GB 4*32GB (Matching sticks)

So everything looks ok in bios and all ram is seen. When I installed Ubuntu it only showed 64GB installed. Same on debian when I tried

When I installed windows server straight away it picked up the correct amount of Ram. 128GB

Anyone any ideas?

Regards
 
What does "free -m" and "cat proc/mem" show in Linux? Would be helpful to get a "dmesg" too - you tried reseating the modules? I know they work in Windows, but worth a try. Also might be worth trying each slot one by one in Linux. I'd also run memtest. Are they running ECC or anything?
 
Rroff said:
Did you install 32bit OS instead of 64 bit? IIRC both Debian and Ubuntu cap at 64GB in 32bit mode.
Click to expand...

I considered this, but as they mentioned Ubuntu, I don't think Ubuntu even offer a 32-bit release these days - not to say you can't download an older copy of course.

I may be wrong*
 
Throrik said:
I considered this, but as they mentioned Ubuntu, I don't think Ubuntu even offer a 32-bit release these days - not to say you can't download an older copy of course.

I may be wrong*
Click to expand...

Haven't paid much attention when installing it in awhile so not sure off the top of my head.
 
So memtest ran for 8 hours and all passed.

I tried ubuntu server this morning and it sees all the ram. (I was looking normal ubuntu since it has a gui) but I might have to stick with ubuntu server.

The ubuntu image i was using was ubuntu 24.04.03 desktop - amd 64

So yep im confused lol
 
area51_for_psx said:
So memtest ran for 8 hours and all passed.

I tried ubuntu server this morning and it sees all the ram. (I was looking normal ubuntu since it has a gui) but I might have to stick with ubuntu server.

The ubuntu image i was using was ubuntu 24.04.03 desktop - amd 64

So yep im confused lol
Click to expand...
Do the Ubuntu settings say you have the 64bit version installed?
 
Weird one, maybe the desktop is reserving a large chunk of RAM for some reason. As mentioned already dmesg may give you a hint. ( dmesg | grep -i reserved, dmesg | grep -i memory etc )

Server option is probably your best choice for the home server anyway, less crap.
 
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