When you click on 7800 Go Series, it sends you to the Go 7800 GTX and 7800 (vanila) main page.. if you click "Tech Specs" it sends you to the 7800 GTX page, which states DDR3 memory (which is more power efficient than DDR 1 and DDR2).. I don't see why 7800 vs 7800 GTX would have different memory..
Okay, upon forther reading, this is from http://www.nvidia.com/page/go_7800gtx_faq.html
Q: How many pipes does GeForce Go 7800 GTX have?
The GeForce Go 7800 GTX has 32 pipes-24 pixel pipes and 8 vertex pipes.
Q: How many pixel shading engines does GeForce Go 7800 have?
It has 24 pixel shader units.
Q: How many vertex shading engines does GeForce Go 7800 have?
It has 8 vertex shader units.
Q: What kind of memory does GeForce Go 7800 use?
GeForce Go 7800 supports DDR1, DDR2, and GDDR3.
So the GTX has 32 pipes, 24 pixel 8 vertex..
Does the next 2 Q's say 24+8 or 24 total, 8 vertex (for 16+8)?
I could also be wrong on the memory.. it could be any of the 3.. depending what Dell chose.. Boy that's confusing..