Boost your systems performance with the 8GB DDR4 2666 MHz 288-Pin UDIMM Memory Module Kit from Crucial. Delivering speeds up to 2666 MHz, this set of two single-ranked 4GB RAM modules with x 8-based chips is designed to improve your computers start-up times, overall responsiveness, & ability to handle data-intensive applications. The modules are unbuffered, feature a CAS latency of 19, & and work on systems with 288-pin DIMM slots & DDR4-enabled chips.