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What is the difference between a PCI-E interface SSD and a SATA interface?

Different communication buses, Different maximum transmission speeds. low cost, and simplicity of design with PCIe SSD.
PCIe-SATA-SSD

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The difference between PCI-E interface SSD and SATA interface is that the communication bus is different; in terms of maximum transfer speed, the former can reach 16Gbps and the actual transfer speed is about 1560MBps, while the latter is only 8Gbps and the actual transfer speed is about 560MBps; in addition, the PCI-E interface bus has a simple structure, low cost, and simple design, and SATA has a stronger error correction capability. The following is a detailed description.

Different communication buses

  • PCI-E interface SSDs communicate with the motherboard using the PCI-Express bus.
  • SATA interface SSDs communicate with the motherboard using the SATA serial bus.

Different maximum transmission speed

  • The PCI-E interface can reach a maximum transfer speed of 16Gbps, and the actual transfer speed is about 1560MBps, so the PCI-E SSD is far ahead of the SATA SSD in both sequential read/write and 4K test AS SSD runtime speeds.
  • SATA interface with a maximum transfer speed of only 8Gbps and an actual transfer speed of approximately 560MBps.

Advantages

  • The greatest advantage of PCI-E is the simplicity of the bus structure, its low cost, and simplicity of design.
  • The SATA advantage is that the bus uses embedded clock signals and has a stronger error correction capability. Its biggest difference compared to the past is the ability to check the transmission instructions and automatically correct errors if found, which largely improves the reliability of data transmission.

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