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Dell use Intel's North Bridge the 82845G with integrated graphics and share system memory.
The 82845 has a faster draw rate then the 82830G and the i810. But there are a few changes in the chip for example no over plane.
The main difference to users is they changed the memory allocation.
So as ac_dispatcher nicely provided the link u will have to run a patch called the 845patch.
This will allocate memory to the graphics and enable full screen. here is the link
http://geocities.com/randomnumberge...845patch.tar.gz
BUT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Xfree86 driver i810 is very pore performer and is probably at worst with the 845G.
If U can afford $69 US go here
www.xig.com
They have a driver for the intel series with almost a 10 fold performance increase.
I went from about 1 frame every few seconds to full game speed with Quake 3.
Xig benchmarked it from 80,000 char/sec to 600,000.
Also supports dual head.