Back from the article....
Windows views several types of video memory. It only displays certain types and configurations (that's why the numbers vary) - and how it counts it varies also.
I think that there's settings in the BIOS (either the "commit" settings or the "aperature") that'll affect this - but I'm guessing here.
The article describes 4 types of memory for video:
Total Available Graphics Memory (that's everything)
Dedicated Video Memory
System Video Memory
Shared Video Memory
Even discreet video cards can use Shared Video memory - it just may not be visible to you, the user. Some video cards will report more dedicated memory than the card actually has - this is usually because it has Shared memory reserved for it's use.
Shared memory is of 2 basic types:
The differences between the 2 have an impact on the amounts shown in the different settings.
It seems that DirectX is the most reliable method - but it's not 100% certain in XP. DX10 "should" solve a lot of these issues.
Finally, it's the Windows System Assessment Tool (WinSAT) that checks video memory and turns on/off Aero in Vista.
So....No, you're not crazy (unless reading all this has driven you there). How much video memory do you have? I dunno - but a look at the settings in your BIOS, in dxdiag, in the display adaptor properties, and in the system info tool will give you a start at figuring out what you have for each of the categories of memory that I described above.
Edited by usasma, 15 February 2007 - 10:48 AM.
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