DDR4 SDRAM is the fastest and most efficient consumer memory available. It’s compatible with Intel’s Broadwell-E which runs in quad-channel and Kaby Lake & Skylake CPUs which run in dual-channel modes. It is also compatible with AMD’s latest RYZEN CPUs running in a dual-channel configuration. The modules found here are designed for Intel Kaby Lake & Skylake, so they’re sold in matching kits of two modules for best performance or single modules for a cheap upgrade. These are the high-end kits, with a speed of at least 3,000Hz.