The Knights Corner (2012-2015) Xeon Phi was based on a modified and scaled down version of the Intel P54C core... the same one used in the original 1995 Pentium. On top of that, each core only runs at 1.053 to 1.1GHz. Why would you think that single threaded performance would be any good for an in order superscalar core that is 20 years old?