Upgrade your desktop with this Samsung Memory kit that includes 4 DIMM modules of 2 MB each, for a total of 8 GB. The RAM has a bus speed of PC3-10600U and a model number M378B5773DH0-CH9. It is compatible with most desktop computers and will provide faster processing speeds. The unit quantity is listed as "unit" and it was manufactured in China. This Samsung Memory kit is perfect for those who need to boost their computer's performance. The unit has been previously used but has been tested and is in good working order. With this RAM, you can expect faster and smoother performance from your desktop computer.