the thing that sets shanghai apart from i7 is power consumption and use of the old socket. you can tack on some more cash onto i7 for having to buy new mobos and ontop of that i believe they use around double the power of the shanghai chips (can't be certain). plus amd has been doing this for awhile(memory controller, hyper transport) and i think i7 might have a few glitches a bugs. so even if shanghai/deneb aren't the highest performing chips they got every other standpoint covered.