Apacer 8GB DDR4 2666Mhz Desktop Memory, Retail Box , Limited 3 Year Warranty. 

Kingston 4GB DDR4-2666MHz DIMM 288-pin Non ECC RAM Desktop Memory, Retail Box , Limited Lifetime Warranty

Specifications
• Product Code: KCP426NS6/4
• Description: Kingston 4GB DDR4-2666MHz DIMM 288-pin Non ECC RAM Desktop Memory
• Memory Capacity: 4GB
• Brand: Kingston
• CASLatency: CL19
• Chip Organization: x16
• Form Factor: DDR4
• Memory Depth: 512M
• Memory Voltage: 1.2v
• Module Type: DIMM
• Operating Temperature: 0°C to 85°C
• Pins: 288 Pin
• Product Type/Family: DRAM
• RAM Memory Type: Non-ECC
• Rank: 1R (Single Rank)
• Speed: 2666MHz (PC4-21300)

Apacer 4GB DDR4 2666MHz Desktop Memory, Retail Box , Limited 3 Year Warranty

Product Overview:
APACER 4GB DDR4 (1x 4GB) memory operates at 2666 MHz with latency CL19. DDR4 memory works at higher frequencies and offers more data throughput and at the same time works at lower power supply than older DDR3.

Transcend 4GB DDR4 2666MHz Desktop Memory, Retail Box , Limited Lifetime Warranty

Product Overview:
Transcend's JetRam memory modules are manufactured with true ETT grade, brand-name DRAM chips that have passed Transcend's strict screening process and rigorous environmental testing. The modules provide excellent compatibility and fully-tested reliability, which is ideal for PC upgrade at an attractive price. Each memory module is rated at 2666MHz to greatly increase data transmission efficiency by higher bandwidth of up to 21GB/s. Operated at a nominal voltage of just 1.2V, Transcend's DDR4 U-DIMM JetRam memory ensures that both operating temperature and electrical load on the memory controller can be reduced in order to save up to 40% of energy compared to standard DDR3 modules offering 1.5V.