HP Professional sp750 Compaq Professional Workstation SP750 and AP550 Key Tech - Page 8

WHITE PAPER (cont'd) Compaq Professional Workstation - Key Technologies Models of the Compaq Professional Workstation AP550 and SP750 come standard with a oneinch 9.1-GB or 18.2-GB Ultra3 SCSI 10,000 rpm hard drive, as well as an integrated Adaptec Ultra3 SCSI controller. Ultra3 SCSI is backward-compatible with all previous versions of SCSI. When an Ultra3 drive is installed on a previous-version (Ultra2 or Wide-Ultra, for example) SCSI bus, performance defaults to the specifications of that bus. Ultra160m SCSI Compared to Other I/O Interfaces 160 120 MB/sec 80 40 0 UDMA 33MB/sec UDMA Ultra160/m Fibre Ultra2 SCSI 66MB/sec SCSI Channel 80MB/sec 160MB/sec 100MB/sec Note: Ultra3 may also be referred to as Ultra160M in the industry. Some vendors have chosen the Ultra160M to identify the next generation of SCSI technology. Compaq has chosen to refer to it as Ultra3. 8