Phison PS5008-E8 NVMe SSD Technical Preview With Performance Analysis

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Oct 20, 2008
"The DRAMless E8T will only scale to 1TB using Toshiba's new BiCS 3 TLC flash, but the E8 will scale to 2TB with the same NAND. It's important to remember that larger drives require a larger address map, so adding extra room for the map allows Host Memory Buffer technology to double the capacity of these entry-level products."

Does this mean that both the E8 and E8T use HMB but the E8 uses it to double the capacity of the E8T? Because otherwise this is confusing as the E8T (using HMB) has half the max capacity of the E8, not double.

"The E8 delivers up to 1,100 MB/s of sequential write speed, but the E8T will only deliver up to 880 MB/s. [...] The E8 delivers up to 280,000/225,000 random read/write IOPS. The DRAMlesss E8T delivers up to 125,000/115,000 read/write IOPS. The E8 is significantly slower than the E8T"

This part has to be a mix up. The E8T is slower than the E8, not the other way around.


Jan 25, 2015
I see your point, it's worded a little funky. Until the Toshiba TR200, all of the DRAMless SSDs we tested only scaled to 512GB.

As for the speed, yes that was flipped around and we will get it fixed asap.
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