Home > Data Protection > PowerProtect DD Series Appliances > Dell EMC PowerProtect DD Series Appliances: Hardware Assisted Compression > Introduction
Dell EMC PowerProtect DD series appliances reduce the amount of data stored by the process of deduplication and compression. The previous generation of appliances compressed data using the default lz algorithm. Other types of compression algorithms such as gzfast and gz were also available. These algorithms offered higher compression but at the cost of higher CPU load, thereby providing a trade-off between performance and space utilization.
The DD6400, DD6900, DD9400, and DD9900 are equipped with hardware assisted compression cards that allow for higher compression using gzfast as the default algorithm without trading off on performance.