Review: Samsung 840 EVO 250GB mSATA SSD
Same Great 840 EVO, Now in mSATA
Several months ago at the 2013 Samsung Global SSD Summit, Samsung unveiled their latest and greatest SSD, the Samsung 840 EVO. Based off a brand new MEX controller and Samsung’s latest 19nm TLC Toggle Mode 2.0 NAND, it quickly became one of the most successful consumer SSDs on the market due to its great performance, competitive pricing, and proven Samsung reliability.
Now I’d have to say ever since the release of the Samsung 840 EVO back in July, I’ve been expecting a mSATA form factor version of the 840 EVO as well, at least on the OEM side of things. When I reviewed the 250GB edition of the Samsung 840 EVO, I noticed that it had a very small PCB, about the size of a mSATA SSD, with only two NAND packages onboard. Given that Samsung already produces a mSATA PM840 SSD based on the 840 Pro, it was logical that an 840 EVO based SSD in the mSATA form factor would arrive, especially since the SATA version’s PCB is already about the size of a mSATA SSD anyway.
Fast forward five months after the initial launch of the 840 EVO and Samsung is now launching the Samsung 840 EVO mSATA SSD. I expected Samsung to introduce a 120GB, 240GB, and 500GB mSATA 840 EVO, but what I didn’t expect was a 1TB edition as well. Whereas the 120GB, 250GB, and 500GB 840 EVOs used four NAND packages or less, the 750GB and 1TB editions used eight packages, which wouldn’t normally fit into a mSATA PCB. This means that Samsung has figured out a way to fit 1TB of data into four tiny little NAND packages. That’s very impressive and it could mean some serious capacities down the line with 8, or even 16 of these high density NAND packages on a full sized 2.5″ SATA PCB.
Samsung 840 EVO mSATA Specifications
|Model||840 EVO||840 EVO||840 EVO||840 EVO|
|Capacity||120 GB||250 GB||500 GB||1000 GB (1TB)|
|Controller||Samsung MEX||Samsung MEX||Samsung MEX||Samsung MEX|
|NAND||19nm Samsung Toggle 2.0 TLC||19nm Samsung Toggle 2.0 TLC||19nm Samsung Toggle 2.0 TLC||19nm Samsung Toggle 2.0 TLC|
|4K Random Read||95,000 IOPS||97,000 IOPS||97,000 IOPS||97,000 IOPS|
|4K Random Write||37,000 IOPS||71,000 IOPS||88,000 IOPS||88,000 IOPS|
|Interface||SATA 3, 6GB/s||SATA 3, 6GB/s||SATA 3, 6GB/s||SATA 3, 6GB/s|
|Warranty||3 Years||3 Years||3 Years||3 Years|
From the specs, it looks like the Samsung 840 EVO mSATA is pretty much identical to the Samsung 840 EVO SATA. The 500GB/1TB editions will have the highest level of performance topping out at 540MB/s sequential reads and 520MB/s sequential writes with 4K reads/writes topping out at 97,000 and 88,000 IOPS respectively.
Our review today will be focused on the Samsung 840 EVO 250GB mSATA SSD. The Samsung 840 EVO 250GB mSATA is rated at up to 540MB/s sequential reads and 520MB/s sequential writes, which is identical to the maximum sequential read/write performance on the 500GB and 1TB models, but it does suffer a bit in 4K write performance, dropping to a maximum of 71,000 IOPS. In order to reach these lofty performance numbers on slower, more error prone 19nm 128Gb TLC NAND, Samsung is implementing TurboWrite technology, which we’ve covered in our review of the SATA based Samsung 840 EVO.
Let’s take a closer look!