[Pre Order - allow extra time] Transcend 4GB JetRam DDR4 2666 MHz CL19 SO-DIMM Memory Module 4GB Capacity, 2666 MHz Clock Speed, PC4-21300, 260-Pin SO-DIMM, 1.2V, CL19 Latency, Unbuffered, 512Mx8 DRAM, Single Rank