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‎01-31-2023 10:32 AM

HP Recommended

INTEL: Not all PCIe lanes were created equal. 

PCIe 4.0 devices are becoming increasingly prevalent. Support for PCIe 4.0 was added with 11th Gen Intel® Core™ CPUs and motherboards, and now the 12th Gen platform offers PCIe 5.0 and full backwards compatibility for 4.0 and 3.0 devices.

But what’s the difference between PCIe 5.0, 4.0, and 3.0? How does PCIe backwards compatibility work? And what are the benefits of CPU PCIe lanes in 12th and 11th Gen CPUs when compared to chipset PCIe lanes?

Not all PCIe lanes work the same way — CPU PCIe lanes connect directly with the CPU, whereas chipset lanes (or “PCH lanes”) go through the motherboard’s chipset, which connects to the CPU via a DMI (Direct Media Interface) link.

The PCH usually manages features on your motherboard such as USB devices, Wi-Fi and Ethernet networking, and onboard sound. Because the link between the CPU and chipset is limited to x8 3.0 total bandwidth, it’s possible to saturate the link if you plug in multiple storage devices and use other resources. Connecting directly to the CPU bypasses this bottleneck.

 

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