Xeon Phi is a line of Xeon CPUs manufactured by Intel, first released in 2011, that are classified as "manycore." They contain a large number of smaller cores to enable high performance by applications that are designed to be massively parallel. The Xeon Phi was initially offered as a PCIe add-on card code-named Knights Crossing. The second generation of Xeon Phi processors, code-named Knights Landing, was released in 2013 as a CPU socketed in a motherboard.
A Knights Landing CPU has 72 Airmont Atom cores, each capable of executing four parallel threads, for a total of 288 simultaneous threads per CPU, running at speeds between 1.3 and 1.7 GHz. The architecture supports up to 384 GB of 6-channel DDR4-2400 RAM, and up to 16 GB of 8-channel 3D MCDRAM.