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Intel argues that AMD pushing PCIe 4.0 is useless: game performance only affects 0.0099%.

via:博客园     time:2019/6/11 18:11:45     readed:937


AMD's Ruilong 3000 and X570 platforms not only bring more CPU cores and stronger single-core performance, but also support PCIe 4.0 for the first time in consumer platforms, with a two-way bandwidth of 32 GB/s. Compared with current PCIe 3.0 technology, the bandwidth of PCIe 4.0 doubles.

On Intel's side, their desktop platform still only supports PCIe 3.0, and the next generation of processors we know have no intention of PCIe 4.0. Now AMD pushes PCIe 4.0 to become the technology leader of PC platform. Intel can't be indifferent. Recently, it has repeatedly claimed that PCIe 4.0 has no significance for game performance.

Intel is not just saying that verbally, but they are also putting the facts in order to help you analyze why PCIe 4.0 is useless, especially for playing games.

The legitreviews website communicated with Ryan Shrout, Intel's chief performance strategist, and Intel offered analysis and testing to convince everyone that PCIe 4.0 bandwidth was not helpful in playing games.


First of all, let's see how much bandwidth we need to play games. Intel lists more than 1920x1080, 2560x144, 3840x2160 resolution, refresh rate, color depth and other parameters. Even at 4K 144Hz 10bit color depth, the maximum bandwidth requirement is only 35.83Gbps.

This bandwidth is almost enough for PCIe 3.0 x4, which has a bandwidth of 31.6 Gbps. A little higher, PCIe 3.0 X8 is enough. 63.2 Gbps bandwidth is far more than 4K 144 Hz HDR1 0.

Up to now, Intel tells you that PCIe 3.0 bandwidth is not the bottleneck through theoretical calculation. Since PCIe 3.0 X8 can meet the requirements of 4K 144Hz, the ultra-high bandwidth of PCIe 4.0 is useless.


Then Intel began to put data, but Intel did not have a PCIe 4.0 graphics card in hand, so the test here is actually that they borrowed the test of TPU website to speak, the bandwidth is only PCIe 3.0 x16, but this is not a problem, because Intel only need to prove that PCIe 3.0 x8, x16 are enough.

From the data cited by Intel, not to mention the ultra-high bandwidth of PCIe 4.0, there is no improvement in game performance from PCIe 3.0 X8 to x16 bandwidth. On average, the performance impact is only 0.0099%. This gap may not even count for the error.


AMD will not be confused with these questions, but the PCI 4.0 applications that AMD pushes are mainly SSD hard drives, but Intel has something to say about this.

From Intel's data, they think that the current performance of high-performance PCIe 3.0 hard disk has reached 3.5GB/s. Current games do not fully utilize the bandwidth of PCIe 3.0x4. Even if some games deviate from their test, they are still within the peak performance level of SSD. In a word, SSD does not need that high bandwidth for reading and writing speed, and the latency is higher than that of SSD. Speed is more important, and the delay of PCIe 4.0 hard disk is virtually unchanged, mainly because the continuous read-write performance is improved.

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