As far as speed goes, raw 64 bit multi core power is lower than the 12 x 2.93 and 3.06 models except the current top 12 x 2.7. GPU power is vastly increased. PCIe SSD's are very quick as well. RAM clock speed improvement is good, but for someone like me who uses Universal Audio PCIe cards it would take over $1000 to get a TB 2 chassis to hold them, which I'd rather not do. Thinking of upgrading my current setup to an 280X and calling it a day.