Your argument makes no sense since Phenom II X6 convincingly beats 2500k in Cinebench R11.5 in stock or overclocked vs. overclocked states. If Bulldozer has at least equal IPC to Phenom II X6 and another 2 cores, it would be at
least 30% faster (8 / 6 = 33% advantage in cores) than the scores posted by a 4.0ghz Phenom II X6 below.
The overclock speeds for each chip in our testing are as follows:
Athlon II X4 635 - 3.7GHz (stock 2.9GHz)
Phenom II X4 970 - 4.0GHz (stock 3.4GHz)
Phenom II X6 1100T - 4.0GHz (stock 3.3GHz)
Core i5 750 - 3.8GHz (stock 2.7GHz)
Core i7 930 - 3.9GHz (stock 2.8GHz)
Core i5 2400 - 3.8GHz (stock 3.1GHz)
Core i5 2500K - 4.4GHz (stock 3.3GHz)
Core i7 2600K - 4.8GHz (stock 3.4GHz)
IPC doesn't matter...give me more cores!