WinXp Pro 32Bits RAM Limit

By tangsuan ·
I need to upgrade the RAM of a WinXp Pro 32Bits to as high as possible, what is the limit on the RAM, is it 4G or 3.5G?

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Ram limit

by Brenton Keegan In reply to WinXp Pro 32Bits RAM Limi ...

I believe it's 3.25, I could be wrong, it might be 3.5. It's definitely not 4.

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Depending on the motherboard chipset, it'll be ...

by OldER Mycroft In reply to WinXp Pro 32Bits RAM Limi ...

Between 3.25GB and 3.5GB.

You can fit 4GB of RAM but only the respective amount of RAM will be 'seen' by the OS.

My gaming rig has a dual boot of Windows 7 Pro 32-bit & Windows 7 Pro 64-bit with installed RAM of 8GB.

The 32-bit OS reports "Installed RAM: 8GB (3.5GB Useable)"

The 64-bit OS reports "Installed RAM: 8GB"

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The upper limit is 3.25 GIG & that Includes Video RAM

by OH Smeg Moderator In reply to WinXp Pro 32Bits RAM Limi ...

But the reality is that to get the best performance if you fit a Matched Pair of 2 GIG RAM Modules you'll have the usable RAM running in Dual Chanel Mode and not the Single Chanel Mode which is faster.

I've found to get the best performance you just fit the 4 Gig's of RAM and let the System use what it can.

This is limited by both the OS which can only use 3.25 GIG and the M'Board Chip Set which may not support that much RAM.

So for the OS you use 4 GIG and depending on the M'Board use either as much as it will hold or fit 4 GIG.


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Just to Add My 2 Cents Worth

by TheChas In reply to WinXp Pro 32Bits RAM Limi ...

The maximum RAM address space for any 32 bit operating system is 4 GB. This is a combined limit of the 32 bit address scheme for the OS,and the chip-set.

The maximum usable RAM varies from an absolute maximum of 3.5 GB for a relatively low end system. To less than 2.5 GB for a system with an AGP video card with over 256 MB of video RAM.

The upper 500 MB to 1.5 GB of address space is used for hardware addresses and other system support functions.

This includes the address space for the PCI bus and all of your plug-in cards.

The more plug in cards, and the more video RAM you have, the less address space is left for system RAM.


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