There are four different m140 XPS laptops..

A few specs would help..

However, All of them should work fine with either FS or SSL...
On the cheapest spec one you've got 512mb ram, which is more then enough for either FS or SSL, 1gb of ram would be a nice amount to have though..

There are loads of reviews on both SSL and FS on here, just do a search for them

nelly