Well this chip technically is not inefficient, it is not as efficient as the Intel offerings. It is however still a better CPU than the previous generations in certain aspects. IPC on these chips is still 4 the same as the intel offerings and up from 3 on the old chips and 2 on P4 "netburst". No that little box still says "Bulldozer" the core is still a bulldozer core. This isn't any different than a rebadged Sargus core which is really just a Regor core tuned down. You would be surprised how little gains they get from LN2 to LHe we will see larger gains moving from stepping to stepping as fab techniques improve. The same way the last batches of Phenom 1 clocked better and the last batches of Phenom II clocked better.