That's one hell of a large performance scale!
Yeah, no kidding, but not surprising either. I wasn't expecting DICE to go so far as alienating the minimum BF3 crowd, especially considering BF4 is on the 360 and PS3 too.
The only change I see from BF3 is the 4GB requirement. The number of BF3 players with <4GB RAM must be exceedingly small.
That's one hell of a large performance scale!