Original Link: http://www.marco.org/2014/10/16/retina-imac-vs-mac-pro

Marco Arment:

Intel’s next CPU cores (Broadwell) are significantly delayed, so in the meantime, they released a few more high-end Haswell models. The Retina iMac’s 4 GHz option is the Core i7-4790K, which is currently the fastest CPU in the world for most single-threaded tasks.

Since the Xeons in the Mac Pro are based on the even older Ivy Bridge microarchitecture, they’ve been lagging behind even the previous iMacs for single-threaded apps. According to early Geekbench reports, the 4 GHz, 4-core Retina iMac appears to be 25% faster than the 6-core Mac Pro in single-threaded tasks and only about 15% slower in multi-threaded tasks. That’s incredible.