Dell advertises the XPS 2 uses DDR3 but says nothing about the 9300 which leads me to assume as others have confirmed that it's DDR1 only.
Other performance notebooks from Alienware, Sager, etc that utilize the GF Go 6800 (non-ultra) advertise DDR3 and sometimes give the option for the less expensive DDR1 version. The X800 mobility is DDR3 also and supposed to perform in between the 6800 DDR1 and DDR3 models (closer to the higher end).
I have not yet seen an advertised laptop with the X800XT mobility which is possibly faster than the 6800Ultra and the first 16 pipe laptop graphics chip. Last month's MaximumPC tested an Area-51 with this card but Alienware doesn't seem to be currently offering it as an option. Maybe due to availablity problems?
I was interested in a smaller gaming laptop and wanted to avoid the Clevo behemoths like the Area-51 or Sager 9880 or even the Dells for that matter. I can pick up a really nice Sager 7620 with the DDR3 6800, a 7200rpm drive, a Gig of RAM, and a Pentium 640 for under $2100 and it comes with the smaller 15.4" WUXGA (1920 x 1200) screen for easier mobility. This thing would definatly kick the crap out of the Dell 9300 with a sharper, albeit slightly smaller screen.