I think the 2G card is almost definately a x2 variety. Be strange for the x2 to have a GT300 in it as they`re generally 2 older gpus welded together.
GT350 however might just be a name, pfft who knows. Let`s see a proper comparison of x2 vS x2 tho when this comes out, rather than these silly x2 vS x1 tests