The Dell M9VK3-RFB is an 8GB DDR3 DIMM memory module for expanding system memory. It is listed as a refurbished module, making it a replacement option for systems that use this memory type.
Its 8GB capacity and 1066MHz speed are specified in the product listing. The DIMM form factor and DDR3 generation describe the module type; compatibility depends on a system that supports these specifications.
The listing also gives 0M9VK3 as a replacement reference for M9VK3-RFB.