Buy Kingston KVR26S19S6/4BK 4GB DDR4 Memory Module Brand: Kingston ValueRAM Capacity: 4GB Memory Type: DDR4 SDRAM Speed: 2666 MHz (DDR4-2666/PC4-21300) CAS Latency: CL19 Voltage: 1.20 V Error Checking: Non-ECC Form Factor: Unbuffered Pin Count: 260-pin Type: SoDIMM (Small Outline Dual In-line Memory Module) Warranty: Lifetime Warranty