So the 4D shaders rumor might not be true. Maybe they saved the VLIW-4 design for the next gen (what the real NI @ 32nm should have been) codenamed S.I.??

To get the increase in performance, it must be a fully redesigned scheduler and front end. Compartmentalized into RPEs. Maybe this new front end was supposed to go with the 4D shaders on 32nm for the original NI concept. Like SA wrote in April when they had 'codenames mixed up' : "a newly redesigned front-end with a mildly revamped Evergreen shader." That would mean it's really VLIW-5.

Oh well, lookin forward to finding out! Exciting!