The Intel Xeon Phi 31S1P is a server/workstation processor with 57 cores, launched in June 2013. It is part of the Xeon Phi lineup, using the Knights Corner architecture with PCIe x16. Intel Hyper-Threading technology is available and effectly doubles the core-count of the P-Cores, to a total of 228 threads. Xeon Phi 31S1P has 512 KB of L2 cache per core and operates at 1100 MHz. Intel is making the Xeon Phi 31S1P on a 22 nm production node using 5,000 million transistors. The multiplier is locked on Xeon Phi 31S1P, which limits its overclocking potential.
With a TDP of 270 W, the Xeon Phi 31S1P is extremely power hungry, which means you need top-notch cooling. Intel's processor supports DDR3 and DDR4 memory. ECC memory is supported, too, which is an important capability for mission-critical systems, to avoid data corruption. This processor lacks integrated graphics, you might need a graphics card.
Hardware virtualization is available on the Xeon Phi 31S1P, which greatly improves virtual machine performance. Additionally, IOMMU virtualization (PCI passthrough) is supported, so that guest virtual machines may directly use host hardware. Programs using Advanced Vector Extensions (AVX) can run on this processor, boosting performance for calculation-heavy applications. Besides AVX, Intel is including the newer AVX2 standard, too, but not AVX-512.