Basically, it's more future-proof and future games are sure to take advantage of it.
If future games are supposedly going to be so killer, they'll probably need more GPU too, so 2gb on a 7850 may not help much anyway.
I can put 5gb of vram on my old 9800gtx, it still won't give me 40fps at maxed 1080 in Bioshock Infinite.
If someone thinks someday they may want to crossfire, I think I'd worry more about that when that day comes. ...Unless they think they can sell their current card for a good deal. Otherwise, they're throwing money at a problem that may never exist.
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