Samsung unveils 840 EVO solid-state drive family


— 8:00 PM on July 17, 2013

There's a new lineup of Samsung solid-state drives on the way. This one seems poised to supplant the budget-focused 840 Series, and it claims to deliver both better write performance and higher-capacity options.

Known simply as the Samsung 840 EVO, the new drive will arrive early next month in 250GB, 500GB, 750GB, and 1TB flavors. Samsung has based the 840 EVO on new 128Gb NAND flash dies, which it has been mass-producing since April using a "10-nanometer class" process. (That's apparently shorthand for any process technology between 10 and 20 nm.) The 128Gb NAND dies are based on "3-bit MLC" technology, which means they behave similarly to the TLC chips inside Samsung's current 840 Series SSDs.

The T840 EVO has a "proprietary multi-core MEX controller" and something Samsung calls TurboWrite technology, which involves an "innovative write acceleration algorithm and high performance write buffer." There's a software "RAPID" mode that can further boost performance using main system memory, as well. We lack specifics for now, unfortunately, but our man Geoff Gasior is visiting with Samsung in Korea to learn more.

What really matters is that the 840 EVO offers much-improved write performance over the 840 Series. Samsung touts peak write speeds of 410MB/s for the 120GB drive and 520MB/s for the 250GB offering. For reference, the 120GB and 250GB 840 Series drives have peak write speeds of 130MB/s and 240MB/s, respectively. We're looking at a two- to three-fold increase with the new generation.

Even the new series' flagship beats the previous-gen champion. The 1TB 840 EVO is rated for peak read and write speeds of 540MB/s and 520MB/s, respectively, with peak random read and write IOPS of 98,000 and 90,000. The highest-capacity member of the 840 Series, by contrast, is a 500GB model with a 330MB/s peak write speed and 63,000 random write IOPS.

We still don't know how much Samsung plans to charge for the 840 EVO family. However, the company's press release specifically compares the new drives to the 840 Series. Considering both lineups use three-bit NAND flash, and both have the same amount of overprovisioning at each capacity point, it's likely these will be direct successors to the 840 Series.

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