If your motherboard has an AGP slot or PCI x16, consider getting yourself a good video card instead of the onboard one. Something in the $100 to $200 range is good enough.
The Video Card is totally seperate from RAM. VRAM is Viedo Ram which is on the Video card. Just like i have 2GB of DDR2 RAM for my system and a whole seperate 256MB RAM for my video that is on my GFX card.