Intel doesn't think PCI Express 4.0 is a big deal and has the numbers to prove it

Intel doesn't think PCI Express 4.0 is a big deal (Image source: 3DMark)
Intel doesn't think PCI Express 4.0 is a big deal (Image source: 3DMark)
After some tests and number-crunching, Intel has concluded that the theoretical bandwidth for PCIe 3.0 x16 (126.4 Gbps) and even PCIe 3.0 x8 (63.2 Gbps) will be more than sufficient for 4K UHD HDR gaming at 144 FPS.

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Motherboards sporting PCIe 4.0 are finally ready to ship this year to succeed the 8-year old PCIe 3.0 standard. To prepare itself for the impending change, UL Benchmarks will be introducing a new benchmark to its 3DMark platform for enthusiasts to test the performance of their new PCIe 4.0-equipped PCs.

Simply called the 3DMark PCI Express feature test, the benchmark will "measure the bandwidth available to your GPU over the PCIe interface" in order to more easily compare bandwidth across multiple PCIe generations. PCIe 4.0 promises two times the theoretical transfer rate over PCIe 3.0 (16 GT/s vs. 8 GT/s) that GPUs, SSDs, and Ethernet controllers can all exploit.

At least one major PC maker, however, is anticipating no immediate gaming benefits from PCIe 4.0. As shown by the Intel slides below, most games and NAND SSDs don't utilize anything faster than PCIe 3.0 x4. Intel even benchmarked two dozen different titles to show no major performance benefits between PCIe 3.0 x8 and PCIe 3.0 x16. Thus, we shouldn't expect significantly faster real-world gaming performance even if the synthetic 3DMark benchmark says otherwise. Much like the drama surrounding its DLSS test, the real-world applicability of the 3DMark PCI Express feature test may be questionable in the short term. We suspect that it'll take a few more years before game developers and SSD manufacturers will want to take full advantage of the higher bandwidth provided by PCIe 4.0.

(Source: Intel)
(Source: Intel)




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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2019 06 > Intel doesn't think PCI Express 4.0 is a big deal and has the numbers to prove it
Allen Ngo, 2019-06-12 (Update: 2019-06-12)
Allen Ngo
Allen Ngo - US Editor in Chief
After graduating with a B.S. in environmental hydrodynamics from the University of California, I studied reactor physics to become licensed by the U.S. NRC to operate nuclear reactors. There's a striking level of appreciation you gain for everyday consumer electronics after working with modern nuclear reactivity systems astonishingly powered by computers from the 80s. When I'm not managing day-to-day activities and US review articles on Notebookcheck, you can catch me following the eSports scene and the latest gaming news.