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PCIe 4.0 SSD actual performance test: only 1% increase in the future

via:快科技     time:2019/7/14 21:32:00     readed:1961


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The hardware used isGIGABYTE Aorus NVMe Gen4SSD, group E16 master, nominal sustained read and write speeds up to 5.0GB / s, 4.4GB / sWith the Ruilong 9 3900X processor and ASRock X570 Taichi motherboard.

Also added a pieceADATA SX8200 Pro 1TB, Huirong SM2262ENG masterThe same is the Ruilong platform.

GIGABYTE PCIe 4.0 SSD Ontology: One group of E16 masters, two flash memories and one cache on the front, and two other flash memories and one cache on the back.

A large radiator with up to 77 grams of copper, quite weighty, completely wraps the entire SSD from top to bottom.

The group PS5016-E16, the first PCIe 4.0 SSD master, eight channels, internal dual-core ARM controller, with two CO-X processing cores.

Toshiba BiCS4 3D TLC flash granules, 96-layer stack, number TABHG65AWV.

SK Hynix DDR4-2133 cache granule, number H5AN8GNCJRVKC.

There are as many as 17 practical application test items. The specific results can be found at the end of the article.

Despite the amazing speed of theoretical testing, PCIe 4.0 did not show any excitement at all, and the overall performance was only 1% higher than PCIe 3.0, and there was no difference.

PCIe 4.0 x2 mode is equivalent to PCIe 3.0 x4 in bandwidth, but it is 3% behind when it loses about 4% of performance.

Interestingly,The PCIe 3.0 mode of the ADATA SX8200 Pro has slightly exceeded the performance of the Gigabyte Aorus Gen4 in PCIe 4.0 mode.

In additionLabelIntelThe gray histogram is the result of the ADATA SX8200 Pro with an i7-7700K test, which is as much as 8% behind. It can be seen that the upgrade from the old platform to the new platform is more than the PCIe 3.0 to PCIe 4.0.

Why does this happen? In fact, very understandable.The PCIe 4.0 SSD performance we usually see is actually a large file continuous read and write, and in a 17 test, there is a 4GB ISO image large file transfer, PCIe 3.0 x4 takes 5.0 seconds, PCIe 4.0 x4 is shortened to 3.8 seconds, an increase of 24%, but it is also the only one that has a significant effect.

If you only compare the continuous read and write speed, PCIe 2.0 1.8GB / s, PCIe 3.0 3.5GB / s, PCIe 4.0 4.4-5GB / s, the improvement is indeed significant, but for general daily applications, 3.5GB / s high speed has been More than enough, it is difficult to respond to the improvement, not to mention that even PCIe 4.0 has not yet fully realized its potential. In fact, it should reach about 7GB/s, so that it really doubles.

on the other hand,Continuous reading and writing continues to improve, while representing a large number of small files read and write4KRandom performance has always been stagnant. In PCIe 2.0/3.0/4.0 mode, regardless of queue depth (QD) of 1, 8 or 32, the performance is almost the same, and in actual testing and application, we encountered the basic It is a read, write, and write of various small and small files. The operation of large files is rare. PCIe 4.0 naturally has nowhere to work.

So, is PCIe 4.0 really useless? This is going to be divided into situations.

If you expect PCIe 4.0 SSD to bring a new and breakthrough application performance, daily operation and game play are all speedy, which is obviously unrealistic. In 99% of cases, PCIe 3.0 is still enough, not to mention the PCIe 4.0 SSD is now expensive. Batch, 1TB is about 3,000 yuan, 2TB is about 5,000 yuan, so it is only suitable for those who are not bad money.

When it comes to cost and price, you can look forward to PCIe 4.0 x2, which is cheaper and uses fewer channels, but the theoretical bandwidth is equivalent to PCIe 3.0 x4, so the future popular PCIe 4.0 SSD will depend on it.

In addition, if you have an old platform, even the six or seven generations of Core Duo seem to be outdated, and after the replacement of the latest Ruilong, the storage performance has also improved, this is very unexpected.

of course,The application and popularization of any new technology will take time. The arrival of PCIe 4.0 will provide more space for more applications that require ultra-high performance, and new technologies will always be promoted, otherwise we will It’s good to stay in PCIe 1.0 all the time.

not to mention,PCIe 4.0 is not just for SSD, in the field of professional content creation,serverAnd in the field of high-performance computing in the data center, PCIe 4.0 has a lot to offer -AMD's upcoming second-generation Opteron processor and next-generation Radeon Instinct computing card will also support PCIe 4.0.

By the way, look at the temperature:

Remove the perimeterfanKeep zero wind,When there is no heat sink, the full speed write is less than 30 seconds, the maximum temperature of the SSD surface reaches 100 °C, and then quickly drops to 300-500MB/s.

Added heat sink,Up to about 80 ° C, without any speed.

Attached to all subtests:

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