Each item for sale is a quad-channel kit that is intended to be used for one processor only. If you have a dual-processor system, please order two items and avoid mixing them with other brands/models for the best performance. When mixed, the memory will perform at the lowest speed populated or the highest speed allowed by the system.The item "Dell PowerEdge R620 T620 M620 M820 64GB (4x16GB) DDR3 1866MHz PC3-14900R Memory" is in sale since Friday, May 11, 2018. This item is in the category "Computers/Tablets & Networking\Computer Components & Parts\Memory (RAM)". The seller is "bloommax" and is located in Gaithersburg, Maryland. This item can be shipped worldwide.