User`s manual

MXGD Series CyberResearch

Motherboards

Figure 2-5: PCIe x16 Expansion Slot

2.4.3.2 PCIe x16 Bus Specifications

The PCIe port is compliant with the PCI Express* Base Specification revision 1.1. The

PCIe x16 port operates at a frequency of 2.5 Gb/s on each lane while employing 8b/10b

encoding; the port supports a maximum theoretical bandwidth of 40 Gb/s in each

direction. Some of the features are listed below.

 One, 16-lane PCIe port intended for graphics attach, compatible to the PCI

Express* Base Specification revision 1.1a.

 PCI Express frequency of 1.25 GHz resulting in 2.5 Gb/s each direction

 Raw bit-rate on the data pins of 2.5 Gb/s results in a real bandwidth per pair of

250 MB/s given the 8b/10b encoding used to transmit data across this

interface

 Maximum theoretical realized bandwidth on the interface of 4 GB/s in each