As part of its commitment to hardware, software, and solution innovation, HP is proud to introduce this breakthrough platform configuration stability to HP Workstation customers. HP Stable & Consistent Offerings are built on the foundation of a carefully chosen set of hardware and software designed and tested to work with all HP Workstation platforms through their end of life. SAS (Serial Attach SCSI) is a high performance architecture designed for high performance servers. 15K rpm SAS drives spin faster than 10k drives and are available with 6Gb/s (Gigabit/sec) transfer rates* offering even more performance than 10K rpm drives. SAS drives require an available SAS storage controller. Note: 15K rpm drives may be audibly noticeable.