PCIe 5.0 SSDs are edging closer to release.
Not a moment too soon, we're finally getting details of retail SSDs supporting the latest PCIe Gen 5 interface at CES 2023. We've already seenTo briefly recap, PCIe Gen 5 doubles peak bandwidth over Gen 4. On paper, that means maximum throughput of 16GB/s versus 8GB/s. In practice, the maximum attainable actual bandwidth will be less due to various protocol overheads.
Take the XPG PCIe Gen5 SSD. Adata says it will be good for 14GB/s reads and 12GB/s writes. Intriguingly, it doesn't use the much-vaunted Phison E26 controller chip, but Silicon Motion's SM2508, which will likely be the other big player when it comes to off-the-shelf controller chips for Gen 5 drives.
While an SSD that can hit 14GB/s peak throughput sounds pretty sweet, it's arguably 4K random access determined by that IOPS performance that most dictates how snappy a drive will make your PC feel.IOPS performance is also where the least gains have been made in recent years with NAND-based SSDs. Which is basically all SSDs bar Intel's now defunct Optane drives, which notably offered far superior IOPS performance.
That 12GB figure is courtesy of Micron's latest 232-layer NAND flash. So, exactly how Adata is hitting 14GB/s is unclear. Then again, Adata isn't talking about availability dates for its drive as yet, so the comparison is somewhat academic.
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