The Samsung SSD 850 EVO mSATA/M.2 Review
by Kristian Vättö on March 31, 2015 10:00 AM ESTAnandTech Storage Bench - Light
The Light trace is designed to be an accurate illustration of basic usage. It's basically a subset of the Heavy trace, but we've left out some workloads to reduce the writes and make it more read intensive in general.
| AnandTech Storage Bench - Light - Specs | ||||||||||||
| Reads | 372,630 | |||||||||||
| Writes | 459,709 | |||||||||||
| Total IO Operations | 832,339 | |||||||||||
| Total GB Read | 17.97 GB | |||||||||||
| Total GB Written | 23.25 GB | |||||||||||
| Average Queue Depth | ~4.6 | |||||||||||
| Focus | Basic, light IO usage | |||||||||||
The Light trace still has more writes than reads, but a very light workload would be even more read-centric (think web browsing, document editing, etc). It has about 23GB of writes, which would account for roughly two or three days of average usage (i.e. 7-11GB per day).
| AnandTech Storage Bench - Light - IO Breakdown | |||||||||||
| IO Size | <4KB | 4KB | 8KB | 16KB | 32KB | 64KB | 128KB | ||||
| % of Total | 6.2% | 27.6% | 2.4% | 8.0% | 6.5% | 4.8% | 26.4% | ||||
The IO distribution of the Light trace is very similar to the Heavy trace with slightly more IOs being 128KB. About 70% of the IOs are sequential, though, so that is a major difference compared to the Heavy trace.
| AnandTech Storage Bench - Light - QD Breakdown | ||||||||||||
| Queue Depth | 1 | 2 | 3 | 4-5 | 6-10 | 11-20 | 21-32 | >32 | ||||
| % of Total | 73.4% | 16.8% | 2.6% | 2.3% | 3.1% | 1.5% | 0.2% | 0.2% | ||||
Over 90% of the IOs have a queue depth of one or two, which further proves the importance of low queue depth performance.
The 850 EVO also shines in our Light trace by being the fastest SATA drive we have tested along with the 850 Pro.
The latency is also great despite the capacity, so I have no problem recommending the 850 EVO for basic workloads -- it's only the heavier workloads that bring the smaller capacities to their knees.
Power is again excellent except for the 1TB model. I'm honestly a big surprised that the 850 EVO is so much more power efficient than the 850 Pro despite the fact that MLC NAND should be more power efficient by design.
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WackyDan - Saturday, April 4, 2015 - link
Eh... Nope. These won't work in the ThinkPads.blanarahul - Tuesday, March 31, 2015 - link
Hopefully, this drive will put an end to the mSATA/M.2 versions of the 840 non-EVO that companies are shipping in their laptops.Samus - Tuesday, March 31, 2015 - link
DoH! I just paid $20 more for the M550 (basically the MX100) 512GB M2 drive, which is double-sided and needs to be crammed into my laptop :\kgh00007 - Tuesday, March 31, 2015 - link
Hey, is there any chance you could fill one of these m.2 drives with data, power it off for a month then check the read speeds when you power it back on?I need some sort of evidence that this TLC V-nand does not have the same issues as the TLC in the 840 EVO.
Otherwise I'm not going to be able to buy one of these!
Cheers!
goodyes - Wednesday, April 1, 2015 - link
What the hell does not the charts compares with 840 ev msata ? Bad numbers Why not true sequential test ??And this site posting SUCKS, Why in the world I cannot use my facebook or so login, Did you know about disquss ? Get out the absurd captcha that fucking me 30 times or so trying to get a magical potion to know what the words saying,. THIS IS NOT ADVANCE IN TECH THIS IS TRASH
Kristian Vättö - Wednesday, April 1, 2015 - link
This is the third review with the new 2015 SSD Suite and I've only had limited time to test drives, hence the lack of 840 EVO in the graphs.goodyes - Wednesday, April 1, 2015 - link
Ya, but results that I have a 1TB 840 msata and write sequential at more than 500MBps around 520max MBps, and now I see than new 850 msata tops at ?? 480MBps ?? cannot be possible what my eyes look, AND WHY THE HELL NO ONE REVIEWER COMPARE With olders 840 msata, so I must think that all of you guys are a paid reviewers and you get money from samsung, if not, YOU MUST compare to older modelcgorange - Wednesday, April 1, 2015 - link
Other than providing samples, I can assure you that Samsung doesn't pay Anandtech to review its productsEkitrak - Wednesday, April 1, 2015 - link
The Final Words page has 2 entries of "Samsung 840 EVO mSATA" on the Amazon Price Comparison. I'm guessing this is an error and one of them is supposed to be the Sata III version?Kristian Vättö - Wednesday, April 1, 2015 - link
I'm not seeing this -- maybe you accidentally mixed up the 850 EVO mSATA and 840 EVO mSATA as they are both in the table (or maybe this was already fixed by another editor).