Xp home doesn't detect 4bg ram only 2.5

January 9, 2012 at 11:07:56
Specs: Windows XP
Xp home doesn't detect 4gb currently installed it only detects 2.5gb but bios picks up 4gb

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January 9, 2012 at 11:19:46
If you want to make full use of your 4GB RAM, install a 64-bit OS.


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January 9, 2012 at 11:26:03
Actually you can't use the 4 gig no matter what. If you went to a 64 bit OS the first thing is you'd loose 1G. Then your motherboard may only allow up to 3.7 gig but normally less. So,,don't mess with it.

Then you'd have to worry about any older programs and any driver for 64 bit and associated printers and unique devices that may not support 64 bit. Just don't play with it. If it is working fine then leave it alone.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.

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January 9, 2012 at 14:02:40
XP can actually recognize only just over 3GB but your onboard graphics will use up some of that allocation so XP is showing you what you can actually use. Upgrading to a 64bit operating system AND installing a video card (if a desktop) should allow you to use all (or most) of your 4GB of memory.
XP really runs well on anything over 1GB and for most programs on XP you probably will never need more than 2GB so don't stress out over it.

You have to be a little bit crazy to keep you from going insane.

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January 9, 2012 at 21:50:51
32 bit operating systems have a physical technical limit of 4g of ram total which includes any ram you may have dedicated to video. So if you have have 4g of ram installed and 1g video card....Windows will only see 3g of system ram, as the 1g on the video card is included. Therefore in that situation you are better off buying 3g's of ram with a 1g video card, and not 4g of ram. As Jefro mentions many older boards had 4 gig ram limits because 64 bit O/S's were not common and 4g limit could not be broached without them. With 64 bit you can have 16 exobytes of ram as the theoretical limit, thus newer boards will hold more than 4g and often take 8 or 16g of ram now. Switching to a 64bit OS will do you little good if your board only handles 4g...so I would be checking that out.

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January 9, 2012 at 23:07:33
Windows XP will recognise all the of the 4 GBs of RAM but wont actually use it. After taking away whatever is used for the integrated Video some of the upper memory from the top downwards is reserved for memory mapped i/o. How much is used varies as it is dependant on the hardware installed and its memory requirements. This is why you will only see something less than 4GBs. With a 64 bit OS the memory mapped region is up in the Terra byte area

This is a feature of all 32 bit Operating Systems, not just Windows. In the days when 1GB of RAM was an enormous amount it didn't matter as the upper memory region that was used for i/o was way out of reach of any RAM that was installed.

With Windows XP the maximum amount of memory any process can use is 2GBs regardless of how much is installed With 64 bit Windows the maximum is 6 Terra bytes but as stated above, how much you can actually install is dependant on the motherboard design. 8Gbs seems the most common with 16 GBs for high end servers.


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