The Samsung SSD 850 EVO mSATA/M.2 Review
by Kristian Vättö on March 31, 2015 10:00 AM ESTSequential Read Performance
Our sequential tests are conducted in the same manner as our random IO tests. Each queue depth is tested for three minutes without any idle time in between the tests and the IOs are 4K aligned similar to what you would experience in a typical desktop OS.
In sequential read performance the difference between drives is rather marginal, but in power consumption we start to see some differences. At 250GB and 120GB the 850 EVO is very efficient, but the 500GB and 1TB are again more power hungry.
Looking at performance across all queue depths doesn't reveal any surprises: at QD2 and higher all drives are practically saturating the SATA 6Gbps interface. What's notable, though, is that the 1TB degrades in performance as the queue depth increases. I wonder if this is a thermal issue (mSATA/M.2 don't have a chassis to use as a heatsink) or just poor firmware optimization.
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Sequential Write Performance
Sequential write testing differs from random testing in the sense that the LBA span is not limited. That's because sequential IOs don't fragment the drive, so the performance will be at its peak regardless.
In sequential write speed the capacity plays a more significant role because the 120GB and 250GB are noticeably behind the 500GB and other higher capacity drives. The poor performance of the 1TB model is once again a surprise, though.
The full graph of all queue depths shows the reason for the 1TB's low performance: it starts high at ~430MB/s, but after that the performance decreases.
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cleverdude - Saturday, April 18, 2015 - link
Bench results have not been updated.http://www.anandtech.com/bench/SSD/65
szhosain - Monday, May 4, 2015 - link
On my Lenovo W530 laptop (about 3 years old now), I just installed a Samsung 850 EVO MSATA 1TB card, and ATTO shows me poorer numbers than seen here. About 267 MB/sec for write and 280 MB/sec for read when it peaks. My 2.5" SSD drives (from OCZ) in the same system are well over 500 MB /sec.Does this perhaps mean that the MSATA interface on this laptop is limited to 3 GB/sec rather than the 6 GB /sec on the standard SATA interfaces?
That would be quite irritating!
Ethos Evoss - Sunday, June 21, 2015 - link
When it comes to mSATA or M.2 connected to SATA III there is no point purchase stupid expensive SSDs as they will perform same as cheapest ones ..So best mSATA/m.2 SSD for SATA III use is the plextor or mushkin (i preffer plextor) which cost less and has great performance
Andrew Field - Wednesday, August 5, 2015 - link
This Samsung SSD 850 EVO mSATA constantly overheats. This is especially the case when copying large files. It rises about 10C every 30-60 seconds, and does not stop until its own overheating protection kicks in. This occurs when it is in a laptop or in an external enclosure (even when open and exposed to the air).Initially I thought I had a bad piece of hardware, but I tested 5 separate units with consistent results.
If anyone decides to test this out, I did the following:
- Step 1: Select a folder with at least 100GB of data
- Step 2: Copy said folder to a new folder (on the same Samsung SSD 850 EVO mSATA)
- Step 3: Monitored the temperature
Result: The temperature begins rising sharply in a few seconds, and does not stop rising until the SSD engages its overheating protection.
greywarden - Thursday, September 17, 2015 - link
I was about to purchase (4) 250GB 850 EVO mSATA drives to put in an Addonics quad mSATA PCIe card, but seeing the latency numbers on the drive has me concerned. Should I look into purchasing a pair of the 500GB models instead? Have the pausing and crashing problems been solved with the 1TB model yet?payamfi - Tuesday, January 19, 2016 - link
Hi guys i wanna buy a memmory for my n551jx i can not decide what to buy msata evo mini or ssd evo pro can anyone help me out?fabbrimichele75 - Friday, March 25, 2016 - link
Would it be possible to know the temperature when the disk is in idle and full load?I'm mainly interested in the M.2 version.
I'm asking because I wanted to mount it on an NUC 6i5 that seems to be sensitive to high temperature.
yolomolo - Tuesday, April 19, 2016 - link
Can i get some advice from you PRO, should i better go get mSata : Samsung EVO 850 or CRUCIAL MX200 ?