Hyperx impact 4gb ddr4 2133mhz sodimm memory hyperx hx421s13ib4 is a 512m x 64 bit 4gb ddr4 2133 cl13 sdram synchronous dram 1rx8 memory module based on eight 512m x 8 bit ddr4 fbga components each module supports intel extreme memory profiles intel xmp 20 this module has been tested to run at ddr4 2133 at a low latency timing of 13 13 13 at 12v additional timing parameters are shown in the pnp timing parameters section below the jedec standard electrical and mechanical sp