The ProLiant DL580, DL320 and DL360 systems are designed to fit into a standard server rack and pack a large amount of processing power in a small space.
The DL580 sits at the higher end of HP's ProLiant line and can fit four Xeon processors in a 4U (7-inch) space. With the latest DL580, HP has added in support for the 1.8GHz-to-2.0GHz Xeon MP chips, codenamed Gallatin.
The system is geared toward handling business software such as customer relationship management (CRM) applications and databases, said James Mouton, vice-president of HP's Industry Standard Servers.
The DL580 is available immediately for $19,810 (£12,655) with two 2.0GHz Xeon chips, 2Gbytes of memory and an 18Gbyte hard drive.
HP has also sped up its 1U (1.75-inch) ProLiant DL360 and DL320 servers. The ProLiant DL360 will start shipping this month with 2.4GHz and 2.8GHz Xeon chips that support a 533MHz front-side bus.
The ProLiant DL320 will also ship this month with a 2.26GHz Pentium 4 processor. The ProLiant DL360 comes with some higher-end features not included in the DL320, such as hot-plug hard drives and hot-plug, redundant power supplies.
Both systems are designed to handle tasks such as Web serving and caching.
The DL360 is priced at $2,599 with one 2.4GHz Xeon, 512Mbytes of memory and no hard drives. Pricing was not available for the DL320, but HP said the systems would start at $1,449.
HP's ProLiant systems support various versions of Linux, Microsoft's NT 4.0 and Windows 2000 operating systems and Novell's NetWare OS.
Although HP holds the top spot among Intel-based server vendors in market share, it lost ground to both Dell and IBM in the third quarter, according to figures from Gartner.
To help keep the pressure on its rivals, HP hopes to keep its products as up to date as possible, said Mouton.