how many casual gamers will go out a buy this card on the store shelves without catching the 128 192 bit difference/? Just like the 7790 was introduced to stop the slide of the 7850 Nvida is dong the same thing with the 192 bit gtx 650ti to stop the slide of the gtx 660. The only difference is nvida's choice to cut down a 660 as opposed to AMD bringing us a a whole new gcn 2.0 card. Cleeve is spot on with his comment on nvidia assaulting the 100-200 price range, where amd makes the bulk of there graphics card money
And what did that achieve, 20% higher power and temps to achieve what is weaker than 7850 vanilla performance. And the HD7790 is not a Sea Islands GCN 2.0 it still premised on Southern Islands GCN architecture. At this point in time th only information out on the GCN 2.0 arch is the 8850 and the 8600's designed for dual graphics support for Kaveri's mind blowing iGPU performance, the 8850 was rumored to be 40% faster than the 7850 it replaces and the 8600's designed for OEM and dual graphics mode for APU's are said to be faster than the current Cape Verde line up (7700s)
The HD7790 delivers 25% better performance than the 7770 and uses less power to produce that result. This 650ti boost is actually the more you look beyond the veil of "oh gosh its an nvida.....jizz" the more you see its fallacy belies its value.