Netac 4GB No Heatsink (1 x 4GB) DDR4 2666MHz DIMM System Memory NTBSD4P26SP-04 is a 512M x 64-bit (4GB) DDR4-2666 CL19 SDRAM (Synchronous DRAM), 1Rx8, memory module, based on eight 512M x 8-bit FBGA components per module. The SPD is programmed to JEDEC standard latency DDR4-2666 timing of 19-19-19 at 1.2V. Each 288-pin DIMM uses gold contact fingers. Memory Capacity 4GB (1 x 4GB) Memory Type DDR4 Module Type DIMM Memory Speed DDR4-2666MHz Pin Configuration 288-pin Registered/Unbuffered Unbuffered Error Correction Non-ECC CL-tRCD-tRP-tRAS 19-19-19-43 Heat Sink None Working Voltage 1.2v