Samsung is launching the latest iteration of their mainstream consumer TLC-based SATA SSDs. The new 870 EVO brings the same generational updates to Samsung's 3D NAND and SSD controller that we saw with last year's 870 QVO. The updated EVO SATA SSD arrives three years after the launch of the Samsung 860 EVO and 860 PRO.

The 870 EVO uses the same sixth-generation Samsung V-NAND (3D NAND) that debuted in the high-end 980 PRO NVMe SSD. Officially, this is "1xx layers", but all signs point to it being 128L 3D NAND. This may sound unimpressive when Micron and SK hynix have already announced their 176-layer 3D NAND, but Samsung's NAND manufacturing process is arguably more advanced: they're still able to manufacture all 128L in one batch, while the competition have all long since adopted string stacking to split the process into two batches (eg. two groups of 88 layers).

The 870 EVO uses the same Samsung MKX controller we first saw with the 870 QVO. Samsung still hasn't shared what's improved with this generation of controller, but we get a bit of a hint from the fact that they claim the 870 EVO offers a 38% improvement to queue depth 1 random read latency compared to the 860 EVO. Since Samsung has previously shared that their 128L 3D TLC only offers a 10% improvement in raw read latency, it looks like the updated controller may be a bigger factor in the drive's overall performance increase. Either way, a 38% improvement in one of the few performance metrics that SATA SSDs have any room to improve on is a bold claim.

Samsung 870 EVO Specifications
Capacity 250 GB 500 GB 1 TB 2 TB 4 TB
Form Factor 2.5" 7mm SATA
Controller Samsung MKX
NAND Flash Samsung 512Gbit 128L 3D TLC
LPDDR4 DRAM 512MB 1 GB 2 GB 4 GB
Sequential Read 560 MB/s
Sequential Write 530 MB/s
Random Read 98k IOPS
Random Write 88k IOPS
Warranty 5 years
Write Endurance 150 TB
0.3 DWPD
300 TB
0.3 DWPD
600 TB
0.3 DWPD
1200 TB
0.3 DWPD
2400 TB
0.3 DWPD
Launch MSRP $39.99
(16¢/GB)
$69.99
(14¢/GB)
$129.99
(13¢/GB)
$249.99
(12¢/GB)
$479.99
(12¢/GB)

Samsung didn't give us the full detailed spec sheet, but among the basic specifications there are no surprises. Peak throughput is as usual limited by the SATA interface. Write endurance is still 0.3 drive writes per day with a five year warranty. The capacity options still run from 250GB to 4TB. Launch MSRPs are substantially higher than current street prices for the 860 EVO and are well into NVMe price territory, but we expect the 870 EVO's prices to come down fairly soon given the overall state of the market with a bit of an oversupply for NAND flash memory. Update: Samsung apparently made a last-minute price drop before launch, but didn't do a great job of getting the word out. The table above reflects the updated MSRPs.

We don't have a full review of the 870 EVO ready today because the timing is rather awkward. It's a bit cheeky of Samsung to launch this drive just two business days after the end of CES, and with only a week of advance notice. We also hadn't started running SATA drives through our new 2021 SSD test suite, so the past several days have kept our new testbeds busy testing the 870 EVO and various other SATA drives to compare against. Preliminary results show that the 870 EVO improves performance across the board for our AnandTech Storage Bench trace tests, though with slight increases in power consumption. Samsung's claim of 38% better QD1 random read performance also looks to be an exaggeration, but we'll be back later this week with a full analysis of the test results.

We also haven't heard any new official information from Samsung about an 870 PRO to round out this generation of SATA drives, but they did mention an 870 PRO in passing in a newsletter last fall. Since their consumer NVMe line has switched over to using TLC NAND for the 980 PRO, there's some uncertainty whether an 870 PRO will continue using MLC NAND. If it does, that will be the first appearance of 128L MLC from Samsung.

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  • Gothmoth - Tuesday, January 19, 2021 - link

    honestly, who is noticing such QD1 performance increases in SATA drives? i have 5 year old SATA SSD that feel as fast as the newest iteration of drives. benchmarks.. yeah! Reply
  • Valantar - Tuesday, January 19, 2021 - link

    Random QD1 performance is exactly what you might notice though, as that's the type of spur-of-the-moment load that largely constitutes the feeling of "responsiveness" in a system. Sequential speeds on the other hand? Those are borderline meaningless in consumer workloads. Reply
  • zodiacfml - Wednesday, January 20, 2021 - link

    yes Reply
  • StrangerGuy - Thursday, January 21, 2021 - link

    Even for QD1 it's still gonna take an abnormally low IOPS that is way below the spec of an average SATA SSD to detect a real world difference. Reply
  • bug77 - Thursday, January 21, 2021 - link

    Not really. When you fire up Windows, Photoshop or something like that, you need to read hundreds of GBs. Granted, it's not all random reads, but the 4k random read of these drives is ~50MB/s. Reply
  • at_clucks - Friday, January 22, 2021 - link

    Hundreds of MB perhaps, definitely not GB. Reply
  • MDD1963 - Friday, January 22, 2021 - link

    The 1 TB unit is now interesting! (Will have to compare it's prices to my old standby Crucial MX500 for which I've used in 10-15 clients' laptop upgrades) Reply
  • bug77 - Sunday, January 24, 2021 - link

    Right, MB. Mistyped. Reply
  • Jorgp2 - Tuesday, January 19, 2021 - link

    That's expensive Reply
  • bug77 - Thursday, January 21, 2021 - link

    I was thinking the opposite: at $250 I can get rid of my last mechanical drive. Though I wouldn't mind stumbling upon a sale. Reply

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