Samsung has dominated the SSD market for a very long time, and every new consumer SSD model the company introduces is noteworthy. The latest product to reach the shelves is the new range of 870 EVO SSDs, building on a decade-long legacy of SATA SSDs. We have tested the 1 TB and 4 TB models from this new product family.

Pushing for SATA

Samsung is one of the few companies still putting significant effort into SATA SSDs and releasing new consumer SATA models. As PC OEMs have overwhelmingly switched to using NVMe SSDs in new systems, even on the smaller capacities, the client/consumer SATA SSD market now exists almost entirely for the sake of DIY system builders and aftermarket upgrades on older systems. Most major consumer SSD brands have either stopped updating their SATA models, or decided to quietly update components without the fanfare of a new model release. Then there are companies creating odd-ball models, such as a 15.36 TB design. Either way, we don't get many new consumer SATA SSDs in for review these days.

(It is worth noting that the enterprise SATA SSD market has seen somewhat more in the way of visible activity, because the longer product lifetimes in that market and the higher profit margins give SATA SSDs more of a long tail of commercial relevance.)

Despite this market shift, Samsung is still focused on a SATA product line, although even Samsung is showing reduced interest in SATA. It took over six months from the release of the QLC-based 870 QVO for its TLC-based 870 EVO sibling to arrive, and there's still no sign of an MLC-based 870 PRO model (or any other MLC SSDs from Samsung based on anything newer than their 64-layer 3D NAND). Furthermore, the new 870 EVO no longer caters to either mSATA and M.2 SATA form factors, focusing solely on 2.5-inch drives. The mSATA version of the 860 EVO disappeared from the market last year, but the M.2 SATA version is still readily available and has tracked market price trends as much as Samsung's drives ever do. It's a bit of a surprise that they're dropping M.2 SATA this soon given how long Samsung supported mSATA.

Given the roughly three-year cadence Samsung has set for their SATA SSD updates, the 870 generation may also be the last.

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
Sequential Read 560 MB/s
SLC 530 MB/s
TLC 300 MB/s 530 MB/s
QD32 98k IOPS
QD1 13k IOPS
QD32 88k IOPS
QD1 36k IOPS
Burst 3.5 W 4.0 W 4.5 W 5.0 W
Average 2.2 W 2.5 W
Idle 30 mW 35 mW
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

We are seeing the usual upgrades in the spec table for the 870 EVO compared to the 860 EVO from 2018. The controller is now Samsung's MKX, a minor iterative update to the 860's MJX. The NAND flash memory is a more significant jump: the 870 EVO is using Samsung's 128-layer 3D TLC, first seen on the 980 PRO. More specifically, our 1TB and 4TB 870 EVO samples are using the 512Gbit dies that were introduced on the 2TB 980 PRO, a model that arrived much later than the smaller capacities built around 256Gbit dies. The preceding Samsung 860 EVO launched with Samsung's 64L 3D NAND, and they appear to have skipped over their 92L generation with their TLC SATA drives.

The performance specifications are very similar to the 860 EVO. Almost all of those performance numbers are limited either by the throughput of the SATA interface or the latency of the NAND itself, so most of the performance numbers are the same across the entire capacity range. The 250GB and 500GB models still have significantly lower sequential write speed after the SLC cache runs out, but this time we don't have official numbers on SLC cache sizes (but we have tested that in this review). On the other hand, Samsung continues to be one of the few brands to provide performance specifications for queue depth 1 in addition to the high queue depth ratings.

Internally, the 870 EVO continues to illustrate just how ridiculously oversized the 2.5" form factor is for modern consumer storage. Even the 4TB model's PCB takes up just a fraction of the internal space, and the 1TB model's even smaller PCB has only a handful of tiny components for the power regulation on its back side—this could have easily been a single-sided board if Samsung wasn't saving space for the extra flash on the 2TB model.

1TB (Left) vs 4 TB (Right)

The SATA Competition: Hard to Determine

Truth be told, there aren't that many new SATA SSDs on the market. To put this into perspective, the most recent SATA competitor we reviewed, the SK hynix's Gold S31, was launched in 2019.

Part of this is down to the lack of focus on the SATA market as mentioned above, but also because SSD vendors have taken to silently updating the hardware inside a product line without changing the product number or announcing the change. Their argument is that as long as they can still achieve the same performance listed in the specification sheet, and adhere to the warranty, the customer shouldn't have to worry about what is actually inside the product. 

We generally disapprove when SSD vendors silently swap out major components without renaming a product, because changing the SSD controller or NAND flash can have a major impact on a drive's performance and power efficiency. Unfortunately, this has long been a common practice for entry-level models, and a few manufacturers have tried it on more upmarket models and been deservedly excoriated when they're caught (eg. ADATA, with the SX8200 Pro).

However, for mainstream SATA SSDs based on TLC NAND and controllers with DRAM caches, there's a lot less potential downside for consumers when the manufacturer silently upgrades the NAND. The SATA interface imposes such a severe performance bottleneck that it's unlikely new NAND would result in a slower drive. Switching to newer NAND with a higher per-die capacity could adversely affect the smallest models in a product line, but the tendency has been for 120GB models to simply disappear instead of being updated—and they aren't missed. We're disappointed that (for example) Micron's Crucial MX500 is now shipping with at least 96-layer NAND rather than the 64-layer NAND it launched with, and likely with Silicon Motion's SM2259 controller that features improved error correction over the SM2258.

Newer NAND in existing SATA models is far more likely to bring benefits to consumers. Maximum throughput cannot increase, but latency and performance at lower queue depths can still be improved marginally. Newer NAND also tends to bring power efficiency improvements, which means that upgrading the storage capacity in a laptop that's a few years old shouldn't hurt battery life even though larger drives tend to be more power-hungry.

The other factor in this is that we recently updated our SSD test suite for 2021, which means re-testing older drives for new performance numbers. In our SSD test suite 2021 article, we prioritized NVMe SSDs, as that is where the market is. We are getting around to retesting the older SATA drives, although these take the longest time to complete - 24 hours for a fast 1 TB drive, up to 100 hours or more for a 4 TB drive, not including the analysis.

So while we're a bit lacking in SATA review samples that reflect the current state of the market, we do have a diverse selection of entry-level NVMe SSDs that have been pushing into the SATA SSD price bracket. These may not be viable alternatives for some use cases (older systems that don't support NVMe, or data hoarders that need lots of multi-TB drives), but for any reasonably recent consumer system with ordinary storage needs, these NVMe drives are real competitors to SATA SSDs. That's the focus on this review.

Trace Tests: AnandTech Storage Bench and PCMark 10
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  • Snowleopard3000 - Friday, February 19, 2021 - link

    It would be nice to see TLC based 16gb and 32gb SSDs..... look at all that empty space, its not like it is that much more work to do it and it will fit fine.
  • Snowleopard3000 - Friday, February 19, 2021 - link

    TB not GB
  • MDD1963 - Friday, February 19, 2021 - link

    With my slightly less than 10 TBW typical usage per year based on my 960 EVO, the 4 TB 870 EVO should last me...240 years? :)
  • Oxford Guy - Friday, February 19, 2021 - link

    I suppose if you're set on buying a Samsung SATA drive, at least if they're all as bad as the 860 1TB QLC drive that has never been stable in a Zen system.
  • toke - Saturday, February 20, 2021 - link

    Isn't SK hynix Gold S31 far better in all graps by a big margin?
  • GeoffreyA - Sunday, February 21, 2021 - link

    This will be a silly question no doubt, but is there no way to implement the NVMe protocol over SATA? Or is it not possible circuit-wise and electrically? (I understand that SATA is serial and NVMe is more parallel in nature.) If this could be done, while keeping a legacy mode for older drives, problem solved: the newer interface in the same port, while retaining backwards compatibility. Or would this idea be disastrous?
  • R3Z3N - Friday, February 26, 2021 - link

    I really wanted to buy 6 8TB SSDs for my build. Instead I went with 2 PCIE NVME SSDS: 980 Pro 1TB boot drive, Sabrent Rocket 4 Plus 2TB, 4 Sata SSDs in Raid 0 on the mobo, and 6 10TB Exos 3.5 drives in raid 10. I get around 1400MBps read on the Raid 10 and 450MBps write with my Highpoint 3720A HBA. It still is a pain to have to create proxy footage to the NVME drives.... I really really want to replace the HDDs with SSDs sooooo bad.
  • Henry 3 Dogg - Friday, July 9, 2021 - link

    "...and power efficiency cannot make big leaps without getting rid of the SATA performance limits."

    OK, I may be being thick. But that just doesn't seem rational at all.
  • PushT - Monday, October 18, 2021 - link

    "Does the world need premium Sata SSDs?" Every single article, you read the same sentiment, formulated more ore less in the same manner. Do we need Sata ssds ? Yes, we need premium large sized sata ssds, as we have needed premium large size HDDs. Increasingly cheaper bulk storage, with the added benefit of EXTREMELY higher random throughput over HDDs, complying with infrastructures all over the world. What is the point of regurgitating the same cheap one- liner in every single article ?
    We have all been using NVME for years now, and yes we know its faster, and yes we know it is the future. But have the thermal challenges been solved ? And more interestingly, is the infrastructure around it changing fast enough for Sata to be discontinued ? If Sata was excluded from computer architecture as of now, could the world cope ? Nope. It is and has always been about price versus performace, and as long as we dont see the demise of HDDs I can't imagine why we would see the death of Sata SSDs.
    So to the original question: Does the world need premium Sata SSDs ? I think the question is wrong. What the industry is doing is trying to find ways to make cheaper nand that is also just as fast. Price versus performance. 870 Evo is not a premium SSD. It is the commercial sample of experimentation. One final question : Given that PREMIUM ssds will cost you an arm and a leg, would you rather your computer system was a hybrid of nvme/Sata SSD, for ultra fast, large and relatively cheap storage and application - Or would you say a few TBs of the insanely fast and expensive premium NVME at the same price, would solve all your problems ? The answer would be the same for most people in the world. Sorry about the rant but it was a long time coming..
  • pentaxmx - Thursday, November 25, 2021 - link

    interesting. Why the reviewer is disappointed when he found out Crucial MX changed 64 layer to 96 layer? Is 96 layer inferior to 64 layer NAND? Shouldn't that be considered an upgrade???

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