How can I determine the Memory size of the video card?

[hahahehe]

I bought Dell 4550 two weeks ago, which comes with a Nvidia MX420 64MB video card.
Today when I entered the CMOS setting, I happened to find that the Memory Size is 128MB instead of 64MB, which is supposed to be.
I went to nvidia.com and downloaded the updated driver, after installed it, the windows xp still says it's MX420, which only has 64MB memory.

I tried the card on my 4500 desktop, but still got the 128MB memory size in CMOS, while recognized as MX420 in the XP system.

I don't know which I should trust. :-(

I copied down the #s on the card. There are four 4(maybe 2?) chips on the card, while there are 8(maybe 4?) memory chips on my Raedon 9700 Pro.
The ID # on the card is MS-8848, which corresponds to MX420. And there is a # 46V8M16 on each of the memory chip, but I don't know what's the meaning of it.

Can anyone know how I can determine the memory size?

Thanks so much, and I really appreciate it if you can help.

 

[Trashman]

In the BIOS you are seeing the amount of system memory accessable to your video card, basically for storage, if you were to check, that amount is adjustable from 32mb to 256mb or so....this is how the AGP bus works..this is not showing you the amount of physical memory on your video card.

 

[heliomphalodon]

Doesn't the card announce its BIOS revision and its memory size on the very first screen at boot time?
Maybe Dell has arranged to hide that from you.

 

[Viper96720]

Looks like your seeing the agp aperture size. Does it really matter if your card has 128mb instead of 64mb?

 

[titanmiller]

I'm almost 100% sure that 420s arnt made with 128mb of onboard memory.