HyperX Kingston Technology Impact 4GB 2133MHz DDR4 CL13 SODIMM Laptop Memory HX421S13IB/4 Fast and powerful performance - HyperX Impact SODIMM keeps you ahead of the curve with the latest advances in mobile DRAM technology. It's tested for compatibility with DDR4 chipsets on leading motherboards. Plug and Play - Installing HyperX Impact DDR4 is easy and hassle-free. It's plug and play and automatically overclocks to the highest frequency published, with no need to adjust BIOS settings. Low DDR4 1.2 Voltage - DDR4's low 1.2 Voltage draws less power and generates less heat for quiet computing and an extended battery life. Slim form and sleek design - HyperX Impact DDR4 SO-DIMM's sleek black thermal label and matching black PCB give it an aggressive look. Its slim form factor makes it ideal for notebooks, SFF PCs and steam boxes. Reliable - 100-percent factory tested Guaranteed - lifetime warranty, free technical support HyperX DDR4 PnP memory will run in most DDR4 systems up to the speed allowed by the manufacturer&#039;s system BIOS. PnP cannot increase the system memory speed faster than is allowed by the manufacturer&#039;s BIOS. Memory overclocking is locked at 2133MHz (Skylake), 2400MHz (Kaby Lake), or 2666Mhz (Coffee Lake} on all mobile processors except H Series Core i7 processors (i7-xxxxHQ or i7-xxxxHK).