Chapter 2 Installation Instructions
26
925XE7AA Series User Manual
PCI Express Slots
PCI Express will offer the following design advantages over the PCI and AGP
interface:
-Compatible with existing PCI drivers and software and Operating Systems.
-High Bandwidth per Pin. Low overhead. Low latency.
-PCI Express supports a raw bit-rate of 2.5 Gb/s on the data pins. This
results in a real bandwidth per pair of 250 MB/s.
-A point to point connection, allows each device to have a dedicated connec-
tion without sharing bandwidth.
-Ability to comprehend different data structure.
-Low power consumption and power management features.
PCI Express will take two forms, x16 and x1 PCI Express slots. Whereas the x16
slot is reserved for graphics/video cards, the x1 slots are designed to accom-
modate less bandwidth-intensive cards, such as a modem or LAN card.
The difference in bandwidth between the x16 and x1 slots are not able to be
sure, with the x16 slot pushing 4GB/sec (8GB/sec concurrent) of bandwidth,
and the x1 PCI Express slot offering 250MB/sec.
PCI Express x1 slots
PCI Express x16 slot
If a performance graphics card was installed into x16 PCI
Express slot, 2X12 pin power supply was strongly recom-
mended since that card may draw 75W power.
Warning:
