On last year’s Ryzen 3000 and X570 motherboards, AMD first supported PCIe 4.0 on desktop processors, a technology that was previously the first to be supported by Inte, and AMD followed suit, this time, AMD first led the push for new technology standards, quite a replacement for the lead brother. What happens to PCIe 4.0 compared to the current PCIe 3.0? AMD has previously explained that PCIe 4.0 offers three advantages:
Faster, x16 bidirectional bandwidth reaches 32GB/s, twice as much as PCIe 3.0.
Downward compatible, PCIe 4.0 can also be compatible with PCIe 3.0 devices.
More connections, pcIe 4.0 bandwidth, 1 top 2, can connect more devices without worrying about performance degradation.
PCIe 4.0’s role on the SSD hard drive has been seen, the speed of at least 5GB/s, compared with the current 3GB/s upgrade is quite a lot, but PC players are most concerned about the issue is PCIe 4.0 to play the game how help? This is also the key to Intel’s attack on PCIe 4.0.
In previous tests Intel said PCIe 4.0 was useless in playing games, and tests showed an average performance impact of only 0.0099%, which was negligible. However, the Computerbase website has also recently done PCIe 4.0 and PCIe 3.0 graphics card game performance test, the results are somewhat interesting.
They compared the latest RX 5000 series graphics cards from AMD, including the RX 5700 XT 8GB/5700 8GB/RX 5600 XT 6GB/RX 5500 XT 8GB/RX 5500 XT 4GB, and comprehensively analyzed the impact of PCIe 4.0 at different memory capacities and under different graphics cards.
Test more, but mainly look at the following two is enough, one is frame time, one is the average performance, and is a summary of multiple games.
Frame time performance impact
Frame rate performance impact
In the 99th frame performance test, the RX 5700 XT and RX 5700, RX 5500 XT 8GB performance under PCIe 4.0/3.0 is basically the same, the gap is the RX 5500 XT 4GB, RX 5600 XT 6GB, the former performance gap of 19%, the latter performance gap of 11% – this result should be more than many people expected.
In terms of average fps performance, the gap between PCIe 4.0 and PCIe 3.0 remains in both graphics cards, but the gap has narrowed, with the RX 5500 XT 4GB gap reduced from 19% to 12% and the RX 5600 XT from 11% to 6%.
Note that in the above test or under the high texture quality, if it is low texture quality, the gap is only 1%, here is not a separate map.
Combined to explain it, PCIe 4.0 compared to PCIe 3.0 can improve game performance? Yes, and in some cases, it is clear that performance growth of nearly 20% shows that PCIe 4.0 is still an advantage.
However, the premise that this advantage can show is cumbersome, because the pcIe 4.0’s bandwidth is only demonstrated when the memory capacity is limited, which is why the RX 5500 XT 4GB and RX 5600 XT have improved performance.
Simply put, the RX 5700 and RX 5700 XT graphics cards are equipped with 8GB of memory, PCIe 4.0’s ultra-high bandwidth is basically useless for them, because its own memory capacity is large enough, and 4GB or 6GB memory graphics card may appear in high graphics memory overflow, so double the bandwidth of PCIe 4.0 can exchange data with memory more quickly, providing performance advantages.
But the problem is again, PCIe 4.0 itself is a high-end platform, performance improvement of up to 20% RX 5500 XT graphics card is obviously not a high-play priority, so the actual match ingested this matter is back to the original point – PCIe 4.0 game useful, but not worth the purpose to toss.