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4 Engineers’ Guide to PCI Express Solutions 2011

As it sits on the verge of announcing the PCI Express 3.0

specification (expected in November 2010), the PCI-SIG

is looking forward to seeing products achieve new I/O

bandwidth standards based on the technology. The group

expects bandwidth evolution for the PCIe architecture will

be driven primarily by graphics, Ethernet, Infinband, stor-

age and PCIe switch applications – the current targets of

the PCIe 3.0 technology.

According to Insight 64 research fellow Nathan Brook-

wood, “PCI Express has already achieved near universality

with regard to market acceptance, so the 3.0 extensions are

more about allowing the standard to keep up with evolv-

ing requirements, rather than driving broader acceptance.”

Brookwood expects that PCIe 3.0 will ultimately impact

client systems (desktops and workstations) with regard to

graphics, and I/O-bound server systems. “The move toward

cloud computing will exacerbate the I/O requirements for

servers,” he adds, “and may hasten acceptance of the new

standard for these applications.”

Brookwood explains that the PCIe 2.0 performance param-

eters were beginning to impact applications in three areas

– graphics, networking and storage. As products incorpo-

rating the new standard go into commercial development,

Brookwood believes the graphics segment will probably

move first. “Consumers (who buy most of the high-end

graphics cards) typically are less risk-averse than the

corporate IT buyers who acquire most of the high-end net-

working and storage systems,” he states. “Of course, users

won’t be able to realize any of these performance benefits

until the chip and system suppliers add PCIe 3.0 support to

their CPUs and systems, and the GPU, storage and network

controller companies update their products for the new

standard. This process will take at least two years.”

PCI-SIG President Al Yanes agrees that desktop and server

products will continue to embrace PCI Express for I/O

bandwidth needs, and he sees opportunities to evolve the

standard in the future for both the high-bandwidth, high-

power I/O space, and the low-bandwidth, low-power space.

“PCI Express has already achieved

near universality with regard to

market acceptance.”

By Cheryl Coupé

PCIe 3.0: The View Ahead

Graphics, networking and storage applications stand to gain

the greatest advantage with the new specification

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