a 250 is abotu on par with a 450 .. sli'd you'd be almost at a 470's lvl ... but not all titles like sli so i'd still pick a 460 over 2 250's sli'd... even though the sli'd 250's shoudl out perform it you have more overclock room with the 460 plus can sli later.
if you already have a 250 though i'd sli it to get mroe life out of your seisting card for cheaper
thanks buddies for ur quick responses.i appreciate it.
I am going to buy a single GTX 460 bcz if i was having a GTS 250 then i should have connected it with another GTS 250 until now.
So i think GTX 460 will be a better option.I was assuming it already that GTX 460 will be a better option.