What is the difference between KIOXIA CD8 CM7 series enterprise SSDs? KCD81RUG1T92 KCMY1RUG1T92 PM9A3

  Let's take a look at the introduction of the parameters of the U. 2 interface of the KIOXIACD8 series, CM7 series and Samsung PM9A3 series

Both CM7 series and CD8 series use BiCS FLASH ™ 5th generation 3D TLC flash memory

The main differences between the two are:

First, CM7 series is in U.2/U.3 form, while CD8 series is in U.2 form.

CM7 series is in U.2/U.3 form, which means that CM7 series products have interface configuration options in U.2 and U.3 forms. This does not mean that the product has two interfaces at the same time, but that the product can be customized and selected according to requirements or configurations, and can choose to use the U2 interface or the U.3 interface.

For the adaptive form of the Armour Hero CMY series, if the host is U2, CM7 is U2, and the maximum speed can support Gen5;

If the host is U.3, CM7 is U.3, and the rate can support Gen4.

Secondly, the CM7 series interface is PCIe Gen5 x4, 2x2, while the CD8 series interface is PCIe Gen4 x4.

The performance of CM7 series in single port (1x4) mode is slightly higher than that of CD8 series. For example, the sequential read speed of CM7 is up to 14000 MB/s, while that of CD8 is up to 7200 MB/s. These are some of the main differences between the CM7 and CD8 series.

Other explanations are as follows:

"PCIe Gen5 x4, 2x2" indicates the configuration of the PCIe Gen5 interface.

"PCIe Gen5" refers to the fifth generation PCIe (Peripheral Component Interconnect Express) interface technology. "X4" indicates the number of channels, that is, 4 channels. "2x2" indicates the connection mode. In this case, "2x2" refers to two ports (2 ports), each with 2 channels. Therefore, "PCIe Gen5 x4, 2x2" means that the product uses the fifth generation of PCIe interface technology, has four channels, and has a dual port configuration. Each port has two channels.

Dual port and multi-channel configurations have the following characteristics:

Higher bandwidth: Multi channel configuration can provide greater bandwidth, which helps improve data transmission speed and performance.  

Redundancy: The dual port configuration can provide redundancy. Even if one port fails, the other port can continue to work, improving the reliability of the system.

Parallel transmission: Multi channel configuration can realize parallel transmission and simultaneously transmit multiple data to improve data transmission efficiency.

Therefore, with dual port and multi-channel configurations SSD It may have higher performance, reliability and data transmission speed, and is suitable for application scenarios requiring high-speed data transmission and reliability.

Port: In hardware devices, port usually refers to the interface used to connect external devices or other components. For example, the port on the PCIe interface is used to connect other devices or components to realize data transmission and communication.

  passageway : Channel refers to an independent path used to transfer data in data transmission. In a storage device or interface, a channel usually represents an independent data transmission path, which can transmit data at the same time.

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