Silicon Graphics SGI Altix 3700 Bx2, User Manual

Page: 111 / 214

007-4377-002 87
Chapter 7
7. PX-brick
The PX-brick is an optional PCI-X based I/O expansion subsystem that connects I/O
devices to your system. The PX-brick supports both PCI and PCI-X protocol. PCI-X
protocol enables I/O devices to operate at clock speeds of up to 133 MHz, or 1 Gbit/s.
This new protocol also enables I/O devices to operate more efficiently, thereby providing
a higher sustained bandwidth at any clock frequency.
This chapter describes the function and physical components of the PX-brick, and it
provides guidelines for configuring PCI cards in the brick. Specifically, it includes the
following information:
• “Product Overview” on page 88
• “External Components” on page 90
• “PCI and PCI-X Card Configuration Guidelines” on page 94
• “Technical Specifications” on page 96
Note: Throughout this chapter, the term “PCI card” refers to cards with PCI or PCI-X
capabilities. When necessary, distinctions between the cards are noted.
For information about installing or replacing a PCI card, see “Adding or Replacing a PCI
or PCI-X Card” on page 136.