Andtech gave the desktop 512MB 8800GT a glowing review. Review can be seen here: http://www.anandtech.com/video/showdoc.aspx?i=3140&p=1
It performs identically to a $600 768MB 8800GTX while being priced at $250 and the 50-100 watts of power savings running idle/at load compared to a 8800GTX is also encouraging and makes it much more likely the 8800GT can be adapted into a mobile chasis.
The 8800GT according to those bench marks is 3-4X faster at higher resolutions than a 7950GT...
If the Nvidia Go 8800GTX is merely a slightly lower clocked version of the desktop 8800GT and Dell keeps on using SLI the M1730 with the 8800GTX SLI should be a screamer and be the true (abet expensive) successor to the M1710 7950GTX we have all been promised instead of the chubbier and more bling bling sibling of the M1710 the 8700GT SLI M1730 is now.