Also implemented in a rackable minitower is the Z820, which supports as many as 24 cores. At the higher end, it can accept Intel's Xeon E5-2687W 3.1-GHz eight-core processors. In 16 DIMM slots, the unit can address up to 512 GB of 1,866-MHz 8-channel ECC DDR3 memory across four channels per CPU. Storage capabilities, graphics and Thunderbolt options mirror those of the Z620. Z420 pricing starts at $1,399; Z620 at $1,689; and Z820 at $2,439.