2x2gb only shows 2.5gb of RAM

Hello,
Just got a new stick of RAM today, previously I had 2gb, but now I thought I´ll have 4gb.
When I booted my PC, it only shows 2.5gb of memory under system. PC wizard does show that I have 4096mb of memory, but only 2.5gb is usable.

I have tried using these stick seperately in both my slots and they are both indeed not broken and they are both 2gb, but when I use them together, I only get 2.5gb. I have dedicated most of my day to searching a solution for this problem, but have not found anything that fixed my problem.

I have read about people with similar problem, but there was no viable solution. I found out that black and yellow RAM slots make a difference, but I´m not sure. I have 1 black and 1 yellow slot. The stick are exactly the same, just different manufacturers.

My specs:
Processor: Core 2 Duo E6400
Mobo: P5V-VM ULTRA
Video: Nvidia 9600GT
OS: Windows 7 64bit
6 answers Last reply
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  1. Welcome to Tom's Forums! :)

    You need to define 'Usable'; look at Hardware Reserved, Total & Installed and post those numbers. Also, make certain the MSCONFIG settings are as shown below.

  2. The msconfig setting are like that, I´ve checked already :)

    Here is the hardware reserved

  3. Okay, looked at your Manual -> http://dlcdnet.asus.com/pub/ASUS/mb/socket775/P5V-VM_Ultra/e2589_p5v-vm_ultra.pdf see Preface VIII 2GB is the MOBO's limit and it suggest to use 2X1GB... You can try upgrading your BIOS but I severely doubt it will help.

    ref - http://support.asus.com/download.aspx?SLanguage=en&p=1&s=22&m=P5V-VM+Ultra&os=&hashedid=n%2fa

    Fix = New MOBO :(
  4. That should´nt be it, because Crucial shows that max for my mobo is 4gb and 2gb per slot. Also on the asus page there was a thread about someone who installed 4gb, but it only showed 3gb.
  5. Crucial is often found to be incorrect; Crucial only lists P5V-VM DH and P5V-VM SE DH ; so I assume your P5V-VM ULTRA is some OEM MOBO from Dell, Gateway, etc.

    The 2GB limit is CLEARLY listed in the ASUS Official documentation, and a Thread means nothing. Perhaps the per DIMM limit is some oddball 1.5GB/DIMM and a 2X2GB yielded 3GB. Also, on 32-bit OSes the limit is 4GB with 3.0GB~3.50GB 'usable.'
  6. Well then, looks like my mobo is going to change soon :)

    Thanks for your help
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