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Windows XP incorrectly detects video memory

Windows XP, nvidia 256mb 8400 gt display detected as 512mb
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patrvic
Asked:
patrvic
1 Solution
 
zappynzCommented:
Go Start > Control Panel > System then click on the devices tab and then load the device manager.
Does your Video Card come up with a little question mark next to it ? If so get the Video card drivers CD and  try and reload the drivers. If it did not come with one try downloading the drivers of the internet. When your PC starts, press "del" or "F1" to load the computers Bios. Have a little look in there.

Hope that helps. - Hamish
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brakk0Commented:
A lot of new cards use turbo caching which means that is uses some of your system memory as extra video memory. So, if it has 256 on board and is using 256 of your system memory, then it would show up as 512.

What is the brand and model # for the card?
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patrvicAuthor Commented:
hamish the drivers are installed fine.

brakk: the card is nvidia 8400gt M 256mb dedicated.
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jamietonerCommented:
What's the make and model of laptop? According to Nvidia's specs the 8400M GT has a max of 512mb of memory.
http://www.nvidia.com/object/geforce_8400M.html
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PUNKYCommented:
As Jamie said, the GT is 512 meg. I will not complain about it at all if you intended to buy the laptop with 256 meg mobile video card, and manufacturing wrongly installed 512 meg for you :o)
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patrvicAuthor Commented:
well not really. I had vista prioir tp xp on the same sony vaio lappy, which did detect the 256mb dedicated and 1gb total memory.
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jamietonerCommented:
What model of Vaio? Possible the video card uses the turbocache feature, how much system memory is xp detecting?
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patrvicAuthor Commented:
VGN-FZ190
system memory  2gb. detected.
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patrvicAuthor Commented:
sorry guys, may be this was a hard question. and lost deep in the tree section.
but/or did it not occur to anyone this could be a driver issue...
greatly appreciate it and double the points if somebody here could come with a solution.
thanks
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jamietonerCommented:
According to Sony's specs this system does use turbocache. The card can have up to 1023mb of video memory (256 onboard and 767 from system ram). What you can allocate to video ram depends on how much ram is installed. It most likely increased to 512mb when you upgraded from 1gb to 2gb. If you want to adjust it you may be able to go into the systems bios and only have the card use the 256mb built into the card(some systems have this option others don't).
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patrvicAuthor Commented:
Well if i have 2gb ram it should not detect it as 512mb rt?! it should say 256(dedicated) or 767(shared)or 1023(shared) but never 512 dont u think.
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patrvicAuthor Commented:
i meant 1023(total).
thanks
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patrvicAuthor Commented:
OK GUYS. I have all spec doubly confirmed using rivatuner. let me rephrase. why does Windows XP detect my 256 mb 8400gt as 512 mb(does not say dedicated or anything)...
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jamietonerCommented:
It depends on ram, 1-gb none shared, 2gb- 256mb shared so 512mb total, 3gb- 384mb shared 640mb total, 4gb(systems max)- 767 shared 1023mb total video memory. "why does Windows XP detect my 256 mb 8400gt as 512 mb" because xp can't differentiate between dedicated video memory and shared video memory and the way the card shares, the shared memory is still visible to windows. If you use a tool like SIW it should show how much built in ram the video card has.
http://www.gtopala.com/siw-download.html
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patrvicAuthor Commented:
So XP and Vista have differect ways of sharing video memory?!!... Cause Vista said 1GB total video memory when confiured with 2gb ram and 128 mb shared with 1gb ram...man that goes into my university IT blog...courtsey jamietoner. :)

Thanks buddy.
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patrvicAuthor Commented:
i almost forgot...You Rock!
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