Some PCIe 5.0 SSDs Confined to 10 GBps; Others Hit 12.4 GBps

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At least three SSD makers — CorsairGigabyte, and Goodram — announced their SSDs based on Phison’s E26 controller with a PCIe 5.0 x4 interface over the past few weeks. Corsair’s and Goodram’s drives offer a maximum sequential read speed of 10 GBps, whereas Gigabyte’s product is said to hit 12.4 GBps. There is a reason for that: No 3D NAND chips are currently fast enough to saturate the controller’s capabilities.

Phison’s PS5026-E26 controller has eight NAND channels, which is typical for client SSDs. These channels support different data transfer rates, but to saturate a PCIe 5.0 x4 (15.754 GBps in both directions), it needs 3D NAND memory with a 2400 MTps interface. Micron was first to announce such memory this July, SK Hynix followed in early August, then YMTC introduced its Xtacking 3.0 architecture enabling a 2400 MTps speed. All of Phison’s E26 demonstrations were with SSDs featuring Micron’s latest 3D NAND chips, and this is when those drives hit ~12 GBps sequential read speeds. Galax is also testing its HOF Extreme 50 SSDs with Micron’s 232-layer 2400 MTps chips, according to ITHome (opens in new tab).

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