Windows XP reads my 1GB RAM as 504mb

Microsoft Windows xp professional w/serv...
August 3, 2010 at 05:58:06
Specs: Windows XP
I have 2 slots and they were both 256 mb even then my pc only showed 502 mb and so I got a new ram it was a 1gb ram so I replaced one of the 256mb rams with the 1gb ram still my pc showed 502 mb of ram and I even tryed to leave the 1gb ram in the pc alone with out a 2nd ram it still showed 502 mb Idk why it does this cause my computer reads it when it starts its just windows

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August 3, 2010 at 08:00:59
Can't really help you without knowing your system specifications ie:

RAM type

PowerMac 9600(1 ghz G4)
512mb RAM
50gb SCSI
ATi 9200 PCI

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August 3, 2010 at 08:43:10
Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard.
The specific model of a brand name system is shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site.
The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.

The model is often also displayed on a logo (graphical) screen early in the boot, but it's often not as specific as the specific model number.

For Dell computers, they have a Service Tag number - the specific model can be determined by using that on their site, or can often be determined there automatically by you downloading some software. The Service Tag number should be on a label on the outside of the case, probably on the bottom on a laptop, on the back on a desktop, and is often also shown in the bios Setup.

You quote both 502 mb and 504 mb . Which is it ?

Where are you finding this 502 mb number ?

That's an oddball amount for the total amount of ram installed in the mboard.
It would much more likely be 512 mb, or 512 minus 8 or some multiple of 8 - it wouldn't be 502 mb - it could be 504 mb.

If your mboard has onboard video, sometimes the amount of ram shared with the onboard video is subtracted from the total amount of physical ram installed in the mboard , or from the amount detected by the mboard if not all the installed ram is compatible ram. .

Not all ram that you think might work will be detected by your mboard properly. The ram has to be compatible with the memory controller that's built into the main chipset, or for recent or fairly recent computers, compatible with the memory controller that's built into the cpu (processor).

When you install ram the memory controller in the main chipset or the cpu can't recognize properly, one of these applies...
- it's not recognized at all. In some cases the computer will not boot when it is installed in that case.
- only part of it's capacity will be recognized
- it's recognized, whether as it's full capacity or not, but installing it produces ram errors when the computer reads the ram.

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August 3, 2010 at 09:56:55
Tubes, some BIOSes reserve 1 or 2MB of RAM plus possibly 8MB for video.

Samual is probably using the wrong RAM. Either exceeding the slot capacity or using high density RAM where lower density is required.

In addition to some system specs we need to know each individual memory module capacity and speed.

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