Original URL: https://www.theregister.com/2014/04/23/review_crucial_m550_1tb_ssd/
It's GOOD to get RAIN on your upgrade parade: Crucial M550 1TB SSD
Performance tweaks and power savings – what's not to like?
Posted in Storage, 23rd April 2014 12:38 GMT
Review Just under a year ago Crucial sent shock waves through the SSD consumer market space with the launch of the M500 series. Not only did the family contain the first near-1TB SSD in this space, in the shape of the flagship M500 960GB drive, but the whole range had been priced at such a competitive level it had rivals scurrying around trying to match it.
Size matters and speed too: Crucial's 1TB M550 SSD
Admittedly, Samsung had a stab at it when it took away that tentative 1TB crown a little while later with launch of the 1TB proper 840 EVO.
Now Crucial has launched the followup to the M500, the M550. The M550 series offers different capacities to the M500 and is available in 128GB, 256GB, 512GB versions. The M550 flagship remains at 1TB along with some keen pricing. Capacities aside, you also get a choice of three formats – 2.5in 7mm, mSATA and M.2.
The mSATA and M.2 versions will be available later in the year. However, the 1TB drive is only available in 2.5in, which is on test here. For the time being the M550 will run alongside the M500 series, giving Crucial a wider range of capacities and performances in its SSD portfolio.
A new controller? Well, almost. The M550 series uses Marvell’s latest 88SS9189 controller which is an update on the 88SS9187 that looks after the M500. Details on the new controller are pretty thin on the ground but it does provide a bit more bandwidth than the 9187.
1TB M550 SSD dissected. Note the bank of capacitors to the top right
It also caters for LPDDR (Low Power DDR) and has improved DevSleep (DEVSLP) support. In this very low power state, Crucial reckons the drive uses just 3mW. These last two new refinements allow the M550 to have better power consumption and potentially offering an improved battery life than previously.
The M550 features an aluminium enclosure offering easy to access the drive's internals once the four corner screws are undone – bang goes the warranty! For storage, the 1TB drive uses 16 Micron 64GB 20nm MLC NAND modules, divided equally between both sides of the PCB. Sitting alongside the NAND on both sides is a single Micron 256MB 1066MHz LPDDR2 DRAM chip for the cache – giving the drive 512MB of cache in total.
The chips continue on the back for this capacity
On one side of the PCB these chips are joined by the controller and a row of power capacitors – just like the M500, the M550 has power failure protection. The new drives also keep tabs on thermal protection too. If the drive exceeds its maximum rated operation temperature of 70˚C by too larger a margin, the drive will throttle back its performance until the drive returns to a safe operating temperature.
RAIN maker
In the 1TB and 512GB models, the NAND has 128Gbit density dies, the same as used throughout the M500 series. For the 128GB and 256GB versions of the M550, Crucial has switched to using 64Gbit density NAND, which offers a better performance potential in a highly competitive section of the market.
In short, the 120GB M500 is rated 500MB/s and 130MB/s for sequential read and writes whereas the 128GB M550 sports figures of 550MB/s reads and 350MB/s writes.
CrystalDiskMark results: uncompressed data (left), compressed data (right)
As with the M500, the M550 supports Crucial’s RAIN (Redundant Array of Independent NAND) technology for increased reliability. The M500 was the company’s first non-Enterprise drive to use RAIN and the parity settings were set pretty tight, mainly to give the 20nm NAND a helping hand to keep it as reliable as possible.
As 20nm NAND is now a more mature product, the parity settings in the M550 have been relaxed to allow more capacity to be freed up as useable storage space.
Also still present in the M550 is 256-bit AES encryption, TCG Opal 2.0 and IEEE-1667 support. The meaning of the latter two is, in effect, a nod that the drive supports Microsoft’s eDrive.
Crucial quotes sequential read/write performance for the 1TB M550 of 550MB/s for reads and 500MB/s for writes, which is an improvement over the M500 960GB’s quoted performance figures (500MB/s reads, 470MB/s writes).
So how do these figures hold under testing? Using the ATTO benchmark it managed a sequential read figure of 557MB/s and 514MB/s for writes, pretty much bang on the official figures, and putting it neck and neck with Samsung’s 840 EVO 1TB (555MB/s reads, 519MB/s writes).
When it comes to dealing with the small bitty file size that most of us use on a day to day basis the M550 does pretty well too. It produced a read score of 27.08MB/s in CrystalDiskMark’s 4K test, which is only slightly better than the 960MB M500’s 25.21. Yet the extra bandwidth the controller brings shows in the write performance, with the M550 producing a score of 91.73MB/s - as opposed to the older drive’s 75.63MB/s.
It’s slighter slower in read performance than the 840 EVO (30.79MB/s) but faster when it comes to writes, as the Samsung drive gave a score of 75.56MB/s in the same test.
The Marvell controller also doesn’t have a preference when it comes to whether the data is compressed or not, as I found out. When tested using CDM’s compressed data test it produced read/write scores of 27.22MB/s and 89.45MB/s respectively.
I then tested the drive using some real life scenarios. Copying a 50GB folder of small files (28,523 items) took just under ten minutes at an average speed of 73MB/s, while copying a 4GB image took just 30 seconds – 128MB/s average. Similarly, a 17GB BluRay image took a mere 2 minutes 18 seconds to copy at a 127MB/s average speed.
Take your pick: the M550 range comes in multiple form factors
The Reg Verdict
As with the M500, the pricing of the M550 series is highly competitive. All those extra enterprise features that impressed in the M500 – thermal and power loss protection, RAIN and advanced encryption – are all still in place in the M550.
Thanks to the tweaked controller, they are joined by some noticeable improvements in performance: in particular. the write speed.
Also, the power savings from its enhanced DEVSLP support will give laptop users yet another drive to ponder on for that essential upgrade. ®