My Comp Won't Read My RAM - Help Please

[SabakuNoTaira]

Okay, so I custom built my computer. It's got a NFORCE 680i LT SLI mobo with Windows XP OS. I bought it with two 1 GB sticks of of NVIDIA SLI ready RAM. The RAM is dual channel PC6400 DDR2 800MHz with 4-4-4-12 timings. I recently just bought another two 1 GB sticks of RAM. I bought the second set of RAM from the same place as my first set. I even clicked the link to the RAM i bought from my order history on the website.

The problem is, that when i put in the second two sticks of RAM my computer doesn't read it. When i go to My Computer > Properties it says I have 2.50 GB of RAM but i have four 1GB sticks in my comp. I don't understand why the second 2GB of RAM only comes up as .5GB on my computer.

When i actually looked at the new RAM, the only difference i see is that the sticker on my old RAM says 4-4-4-12 and my new ones say 4-4-4. I don't know if this could be the problem, but I wouldn't think that this would make my RAM not read.

In case it helps, this is copy and pasted from my 3DMark06 system info.

Memory Info
Total Physical Memory 2.48 GB
Free Physical Memory 1.43 GB
Total Pagefile Memory 4.34 GB
Free Pagefile Memory 3.53 GB

Memory Array 1/1
Max Module Capacity 2 MB
Location System Board
Use System
Supported Speeds -
Supported Types -
Supported Voltages -

Memory Slot 1/4
Installed Enabled Size 1.00 GB
Form Factor DIMM
Frequency 894.0 MHz
Slot A0 [Bank0/1]
Manufacturer None
Type DRAM
Type Details -
Enabled Size 1.00 GB
Total Bit Width 128 b
Data Bit Width 128 b

Memory Slot 2/4
Installed Enabled Size 1.00 GB
Form Factor DIMM
Frequency 894.0 MHz
Slot A1 [Bank2/3]
Manufacturer None
Type DRAM
Type Details -
Enabled Size 1.00 GB
Total Bit Width 128 b
Data Bit Width 128 b

Memory Slot 3/4
Installed Enabled Size 1.00 GB
Form Factor DIMM
Frequency 894.0 MHz
Slot A2 [Bank4/5]
Manufacturer None
Type DRAM
Type Details -
Enabled Size 1.00 GB
Total Bit Width 128 b
Data Bit Width 128 b

Memory Slot 4/4
Installed Enabled Size 1.00 GB
Form Factor DIMM
Frequency 894.0 MHz
Slot A3 [Bank6/7]
Manufacturer None
Type DRAM
Type Details -
Enabled Size 1.00 GB
Total Bit Width 128 b
Data Bit Width 128 b

Thanks in Advance,
Taira

[sPlAtOiD]

Memory Support and Windows Operating Systems

Here is a link that may help you out.

[surgeVel]

Is your system 32-bit or 64-bit OS? If it is only a 32-bit operating system, then your system by default can not read much more ram than 2GB. Most times they can read up to 3GB, but that is not always the case.

Let me know if your system is a 32 or 64-bit OS. If not, then I will look deeper into this.

[carnageX]

Also, remember, it takes into account your video card's RAM as well. Are you running SLI'd cards with 512mb each? Or do you have a single card w/ 1GB memory? 32Bit OS's can only read up to 3.5GB, so that could explain where your missing 1gig could be.