The K20 GPU is often more than twice faster than C2050, which is much better compared with their relative performances in SpMV. The Xeon Phi coprocessor gets the best performance in 14 instances where this number is 5 and 3 for the CPU and GPU configurations, respectively. Intel Xeon Phi is the only architecture which achieves more than 100GFlop/s.
I also experienced very occasional audible stuttering, which is unfortunate, though most of the time everything was fine. Still, this could be annoying. I heard it on music on the iPad and on the Windows tablet, but BBC iPlayer was fine. I guess it may depend on the underlying bitrate and how much data is being transferred. I am reluctant to pin the blame on the StreamPort; rather, it is a common problem with Bluetooth audio, it may or may not be something you experience, and shows that the implementation of the standard (or the drivers) on devices has a little way to go before it is rock-solid everywhere. 2b1af7f3a8