No, you can't upgrade video RAM on any cards that you'd actually want. Some really ancient cards could do it...
The i9100 has a discrete video card. Here is the 128MB MR9700 card. Not cheap. At some point the i9100 seems to have come with a MR9800 card that should also work if you can find it. Here's the instructions on how to R 'n R the card.
You might be able to find one through Dell's parts line at 1-800-357-3355. They have MANY things you can't get on Dell.com.
The i9100 has a discrete video card. Here is the 128MB MR9700 card. Not cheap. At some point the i9100 seems to have come with a MR9800 card that should also work if you can find it. Here's the instructions on how to R 'n R the card.
You might be able to find one through Dell's parts line at 1-800-357-3355. They have MANY things you can't get on Dell.com.