Need advice - onboard video adapter

[Murpheeee]

I just bought a cheap Dell system which has an onboard video adapter on the mobo. (Intel 810 chipset)
I read somewhere that it was a 4MB onboard video chip.

When I ran Sandra it told me that I had 4MB video RAM and 32MB AGP RAM = 36MB video
what is AGP RAM?
Am I better with the onboard adapter than a 16MB PCI card?

Thanks!