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Full Discussion: Installed memory ≠ usable size?
Special Forums Hardware Filesystems, Disks and Memory Installed memory ≠ usable size? Post 302334088 by CRGreathouse on Tuesday 14th of July 2009 06:31:23 PM
Old 07-14-2009
Quote:
Originally Posted by otheus
When you have tuned it down to 128 MB RAM, and checked the memory size again, and if you're STILL missing 512 MB, then I'll eat my words. Ok?
My BIOS doesn't have an option to change video RAM.

I pulled out 2 GB of RAM so I only have 2 GB in the computer. But it's showing up as 2048 MB, not 1536 MB. So the problem only happens when I'm trying to use 4 GB.

So exactly 0 MB of my RAM is used as video RAM when I have only 2 GB installed.

Quote:
Originally Posted by otheus
The BIOS might be allocating 512 MB for hardware, but if it supports a 64-bit OS and a 64-bit address space, then that should not be a problem. You are using a newer (2008 -- his article was in 2007 and referred to "old" motherboards) Motherboard, and it appears it can support this configuration.
I hope that's the case. You can understand if I'm a little wary, though.

---------- Post updated at 06:31 PM ---------- Previous update was at 06:26 PM ----------
Quote:
Originally Posted by gustisok
Ubuntu 6 or 7, 64 bit, showed only 3.5 gb visible. Tried windows with PAE switch, same stuff as with windows 64 bit. Couldn't get my 4GB...

Went to the gigabyte's site, flashed the BIOS, and bang... I've got my 4GB all nice and shiny.
(I don't recommend flashing BIOS unless it fixes stuff you are actually having problem with since many things can go wrong. If you are desperate enough, give it a try.)
That sounds promising. I may try it.

Quote:
Originally Posted by gustisok
Btw - as Otheus said - check the BIOS settings.
As you probably know yourself, there's bunch of stuff to configure, might be there's some for RAM speed, etc that you missed or require manual setup.
The two things that I most wanted to change were RAM speed and video settings, but my BIOS doesn't seem to have options for either! It's strange, because I'm used to seeing both. Maybe the RAM speed is there and I just missed it because it was listed as a multiplier rather than a speed. Hmm...

Quote:
Originally Posted by gustisok
Also - check motherboard manual, might be there's some jumper that needs placing on a different spot (as with overclocking the processor in some cases - but I've never seen something like it for RAM before).
OK, I'll check that. I had a lot of trouble getting this computer to work -- the original motherboard never worked but conducted enough voltage that it fried the 3 (!) processors that were installed (one at a time, naturally -- two by me and the third by a Microcenter tech), so I've read the manual rather closely. But I haven't consulted it in the months since.
 

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