Ram is not showing in Windows

Nvidia / 780i sli
November 16, 2011 at 12:12:15
Specs: Windows XP, 3.5/4gb
I have 2 x 2gb 800 mhz SLI sticks only reading 2.5gb. They are installed on the dual channel slots in a nforce 780i SLI motherboard. I can install one stick at a time and get 2gb out of both sticks of ram. Together and installed in the color coded dual channel slots windows reports I have only 2.50GB......I am thoroughly confused. I should have 4GB - what is being currently used for a 32 bit system. It should be around 3.85GB and it is not. Ant suggestions? When I was in the BIOS it shows. But windows is not seeing it.

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#1
November 16, 2011 at 17:59:18
A few years ago I dual booted Vista 64 and XP-32 on a 4GB SLI system. Back then, I had a pair of 8800s running in SLI mode, and all of that video memory resulted in just 2.5GB of useable memory under WinXP (video memory counts as a part of the 4GB limit that 32-bit operating systems impose).

You have an SLI capable board, are you running two video cards? Or a single video card with 1GB+ of VRAM?

Socket 939 | Dual-core Opteron 185 @ 3.2GHz | 4GB | 1.0TB | Win7 x64
GeForce GTX 460 1GB | X-Fi Ti Pro | A8N32-SLI Deluxe | Antec P182


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#2
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#3
November 17, 2011 at 07:11:40
Last night I replaced the two Video cards running in SLI (one of the two cards crashed) with One Video card that has 1024 or 1gb of Video Ram. Smoking Video now. The card that I put in can later be paired and ran in SLI if I want to upgrade further.
I have now rechecked what windows is reporting for Ram...And I am now up to 2.75GB.
Why is the Video card subtracting from Motherboard Ram when it has 1 GB of on board RAM. When I pulled the two SLI cards out the Ram went up by .25.
Now Running One NVIDIA GTX560 2 x 16 EVGA. How do I free up more ram for the OS? The machine is just way to slow. Gaming is great with the new Video card, but it takes an act of recreation to get to the Game...

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#4
November 17, 2011 at 10:26:46
"Why is the Video card subtracting from Motherboard Ram when it has 1 GB of on board RAM."

As I wrote in my previous reply:
"video memory counts as a part of the 4GB limit that 32-bit operating systems impose"

A 32-bit OS can only address 4GB of memory, and that not only includes system RAM, but also any memory found on video cards, high-end RAID controllers, etc. So if you have a 1GB graphics card, you'll only be able to use 2.75-3.00GB of your system RAM.

"How do I free up more ram for the OS?"
Upgrade to Windows 7 64-bit. Not only is it a much better OS in general, but it'll let you use all of your RAM as well as the DirectX 10-11 features of your new video card.

"The machine is just way to slow."
Probably caused by something other than RAM. 2.75GB is more than enough for WinXP. Do you have a bunch of extra software running in the background?

Socket 939 | Dual-core Opteron 185 @ 3.2GHz | 4GB | 1.0TB | Win7 x64
GeForce GTX 460 1GB | X-Fi Ti Pro | A8N32-SLI Deluxe | Antec P182


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