just bought a XPS8000 and will be using for amateur AVCHD video editing. So, I feel the Nvidia GTS240 may fall a little short.
What's the best bet...sould I install a 2gb, and if so which is suitable?
Did you buy a used computer? XPS 8000 is from 7 years ago. The latest model is XPS 8900. Ditto for the GT240--neither the computer or the card would be suitable for video editing IMO.
BLUERAY AVCHC editing requires much newer hardware.
Blu-ray 3D disc with Hardware Acceleration
The playback of high definition DVD titles requires higher CPU speed. The following is a list of the recommended CPU requirements to play Blu-ray 3D Disc titles:
Intel Pentium D 950 3.0GHz or above.
Intel Core i5 650 3.2GHz or above.
Dual or quad core processors recommended
For the full list of supported processors, please click here
Blu-ray Disc drive
For more information about supported optical drives, please click here
For information about the latest graphics card support, please click here