Crucial MX300 750GB SSD Review

Micron's new 3D flash comes to market first in a limited edition MX300 750GB SSD. The new drive joins Samsung's 3D with TLC in the mainstream category.

Early Verdict

For some the Crucial MX300 Limited Edition 750GB drive will be a massive disappointment. We would rather look at the potential for growth and what is around the corner. We can wait a little longer since the world isn't buying flash at a high enough rate as it is. If Crucial really wants to sell some flash it has the potential to build products that people really want to buy. Let's hope the 750GB capacity size is the starting point for 3D TLC so we can finally live the dream of high capacity flash-based storage.


  • +

    3D TLC triples the density of existing planar TLC so there will be large price reductions in time with the MX300. Hardware-enabled power fail protection for data at rest is a big plus for those that like their data.


  • -

    The MX300 suffers from high latency and heavy disk usage to complete elementary tasks. The 5 seconds of system hang time would be impressive in a slam dunk contest. I didn't want to build that Excel chart now, anyhow.

Why you can trust Tom's Hardware Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.


Micron had a good run with 16nm planar (2D) flash, but now it's time for the company to jump on the 3D bus with Samsung and SK hynix so it can scale up density. In fact, Micron's 3D TLC NAND triples the density of today's 16nm planar flash. Looking to the future, that'll help lower SSD pricing and enable higher-capacity drives.

Perhaps you doubt that 3D NAND will cut the prices of SSDs in half, but we're certain this will happen in the next 12 months. Flash demand is low compared to what the foundries are cranking out. Unless companies are willing to turn their manufacturing lines off, the supply side will continue to grow. The easiest way to increase demand is to bring prices down until customers react.

Given the current climate, this is an odd time to introduce a new generation of flash. The hope is that higher densities will agitate the market and bring about a revolution that starts in the datacenter and trickles down to the desktop. Flash may finally achieve price parity with mechanical storage in typical notebook capacities. At the same time, enthusiasts should expect more options in the 2TB+ range. Within 48 months, we will have a client-focused 10TB SSD.

Swipe to scroll horizontally
Technology Multi-Level Cell (MLC)Triple-Level Cell (TLC)
Density32GB (256Gb) die48GB (384Gb) die
Process Node, Bit/Cell3D, two bits per cell3D, three bits per cell
Speed Grade533 MT/s and 667 MT/s533 MT/s and 667 MT/s
Page Size16,384 + 2208 bytes16,384 + 2208 bytes
Pages Per Block10241536
Block Size16,384 + 2208K bytes27,888 bytes
PROG (Typ/Max)1300µs/2500µs1630µs/5000µs
P/E Cycle3000 + read retry1500 LDPC / 500 BCH
ONFi Compliance4.04.0

Before we go into depth on Crucial's MX300, let's look at the 3D flash that will power the company's next generation of SSDs. There are currently eight part numbers for 3D MLC packages and they range from 32GB (one die per package) to 256GB (eight dies per package). Three packages feature FortisFlash. There are 10 different packages for 3D TLC and they range from 48GB (one die per package) to a whopping 768GB (16 dies per package)! Six of those packages utilize FortisFlash technology to enable higher endurance and boost burst performance. 

FortisFlash added Dynamic Write Acceleration (an emulated SLC layer) to Micron's line-up, among other features. It was a good start, but the company made several advancements for its 3D flash introduction. For instance, this is the first 3D NAND to use floating gates, the technology both Intel and Micron have utilized for many years. Samsung and SK hynix employ charge trap technology. SK hynix tried its hand with floating gates, but found them difficult to work with at this scale. IMFT tells us the technology is worth the effort; it reduces noisy neighbor cell disruption and charge loss. While those conditions are not a problem with competing 3D flash at this point, as the stack moves up vertically and shrinks on the horizontal plane, the laws of physics impose some restrictions. IMFT thinks floating gate technology will provide an edge down the road.

The new flash utilizes four planes (quad plane) to interface with the flash processor. Samsung has used dual-plane 3D NAND to its advantage for several product generations. Micron should be able to level the performance field and be competitive once again with quad plane 3D NAND.

Key Benefits

Per Crucial:

  • "Pack in more capacity: get 3x the capacity of existing planar NAND products to enable up to a 2TB gum stick-sized SSD with our MLC 3D NAND and a 3.5TB gum stick-sized SSD with our TLC 3D NAND and more than 8TB with MLC 3D NAND and 10TB with TLC 3D NAND in standard 2.5-inch SSDs.
  • Boost performance: achieve significantly higher read/write bandwidth and I/O speeds, as well as improved random read performance, thanks to our 3D NAND’s fast 4K read mode.
  • Save power: reduce power consumption in standby mode thanks to 3D NAND’s new sleep mode features that cut power to inactive NAND die (even when other die in the same package are active)."

Crucial's MX300 is the first product to utilize IMFT's new 3D NAND technology, and the first model in that family is a limited-edition 750GB SSD. It packs two dies onto each package and puts eight packages on a PCB. The company plans to add drives to the MX300 line-up as manufacturing ramps up and it starts producing other package configurations.


All Storage Content

Even though we saw a working demo at CES with Silicon Motion's 3D-compatible SM2258 controller, Crucial chose to use Marvell's 28nm Dean controller for the MX300. The 88SS1074-BSW2 surfaced in May of 2014, and is a four-channel processor with support for low-density parity check (LDPC). Crucial builds the firmware in-house to work with hooks embedded into its flash, allowing the company to realize better performance and endurance.

The 750GB MX300 we're testing today has 768GB of raw flash. It sets aside some space for background activities like garbage collection and wear leveling. Of course, we'll see 500GB and 1TB versions in the future. However, don't be surprised if there is no 128GB-class model outside of the embedded market. We know that Micron is going for multi-terabyte capacities, so SSDs are going to get bigger and leave some of those legacy sizes behind.

As you might have guessed given the four-channel processor, the MX300 is a mainstream product. Crucial says it achieves up to 530 MB/s sequential reads and 510 MB/s sequential writes. Random performance peaks at 92,000 read IOPS and 83,000 write IOPS with the aid of Dynamic Write Acceleration.

Advanced Features

  • Dynamic write acceleration
  • Redundant Array of Independent NAND (RAIN)
  • Multistep data integrity algorithm
  • Adaptive thermal protection
  • Power-loss protection
  • Data path protection
  • Active garbage collection
  • TRIM support
  • Self-Monitoring and Reporting Technology (SMART)
  • LDPC Error Correction Code (ECC)
  • Device sleep support
  • AES 256-bit hardware encryption (TCG Opal 2.0 and IEEE-1667-compliant)

All of the advanced features carry over from previous Crucial SSDs. The MX300 doesn't offer anything new aside from its flash. It's also the first Crucial SSD with this Marvell controller. Even still, we're glad to see power-loss protection carry over, since it ensures data in the lower pages during a power loss. This form of power loss protection is geared to preserve data at rest and very few consumer SSDs offer this level of protection. 

Pricing, Warranty & Accessories

The 750GB MX300 has an MSRP of $200. In addition to the drive, you get a key for Acronis TrueImage HD and a 7-to-9.5mm adapter bracket. Crucial's Storage Executive software was not available when we first tested the MX300. The updated software is now available and enables Momentum Cache, a DRAM buffer algorithm that increases disk performance.

The MX300 ships with a three-year warranty that is limited to 220 terabytes written. That endurance rating breaks down to 120GB of writes per day for five years.

Although it's only a small change, the limited edition 750GB MX300 ships in a silver box instead of Crucial's normal blue packaging. Similar to the company's other SSDs, there is no performance information printed on the box; you will have to do your homework before encountering this thing on a store shelf.

If the back label didn't give you a model number, you'd have a hard time distinguishing the MX300 from Crucial's two previous generations. The drive's chassis is similar to those coming from Taiwan and China. It is a screwless design held together with friction and tabs. The metal is very thin, though that shouldn't present a thermal problem since Marvell's four-channel controller generates very little heat.

The MX300 does use a printed circuit board that we haven't seen before. We suspect Crucial could shave a bit off one end, and it's possible that future 2.5" MX300s will incorporate optimizations to make them shorter. 

Note the strips of capacitors between the controller and flash. They're supposed to keep the flash running long enough to save data in lower pages if power is lost. Most of us don't appreciate this until we need it, and we wish more SSD vendors would go to as much trouble to keep your information protected.

Controller & Flash

As mentioned, the star of this show is Micron's 3D NAND. The new flash comes up in the company's decoder as MT29F768G08EEHBBJ4-3R:B, but we couldn't find any information on Micron's website for that part number. We do know the density is 96GB per package, and each package contains two dies. This configuration facilitates FortisFlash technology for Dynamic Write Acceleration and other advanced features that increase endurance and boost performance. Micron will also sell 3D without FortisFlash in both MLC and TLC, though most of the part numbers we've seen include the extra features.

Chris Ramseyer
Chris Ramseyer is a Contributing Editor for Tom's Hardware US. He tests and reviews consumer storage.
  • FCsean
    Stick with the 850 Evo I guess
  • bit_user
    I've always done well with Crucial. Price per GB is competitive, even if their performance was middle of the pack.

    More importantly, the end-to-end error-correction offered in their MX100 and MX200 were key, for me. I don't even mind sacrificing a bit of performance, for it. I wonder if the MX300 has it?
  • poppypl
    What was drive's firmware during tests? Was it M0CR011?
  • mapesdhs
    Typo in the first page, "... enthusiasts should expect more options in the 2GB+ range." - I'm assuming that should be 2TB.

    Pity about the performance, I had high hopes until I started seeing the results. OTOH, some do care more about capacity and price, so it may be that Samsung and others have to lower the prices anyway if Crucial can pinch some customers away.

    One thing, does Crucial's modern SSD management tool allow one to do a secure erase without having to use a 3rd-party program or reboot the system? That wasn't the case with older models and was a big no thanks for me; always liked the way OCZ's tool could do a SE on the fly, and now Samsung's Magician can do that aswell (can't remember if SanDisk can).

    I look forward to the death of 64GB/128GB models, they're holding things back. It'd be good if 256GB could die by the end of this year aswell, but I doubt that'll happen.
  • uglyduckling81
    Most people wouldn't know or care about the difference between a Sammy Evo drive and this. All they will see is the capacity and the price. Make it cheaper and they will come.
  • mdd1963
    Any new rigs would seem incomplete without an M.2/NVMe capability, and, specifically, ...a Samsung 950 Pro and it's 2000+ MB/sec! (The rest of the SATA old school SSDs can battle over 500 vs 510 vs 550 Mb/sec, etc..)
  • CaedenV
    18119633 said:
    Any new rigs would seem incomplete without an M.2/NVMe capability, and, specifically, ...a Samsung 950 Pro and it's 2000+ MB/sec! (The rest of the SATA old school SSDs can battle over 500 vs 510 vs 550 Mb/sec, etc..)

    Perhaps for you and I, but someone like my dad would love this kind of drive. Much more space than older SSDs, while still providing much faster performance than a traditional HDD, all while keeping the price down. There may be other SSDs on the market that provide a little cheaper $/GB, but I would bet that this drive will drop in price with time to reflect how it performs compared to others.
  • Sakkura
    This SSD should either have been that bit cheaper to really compete with the planar TLC drives, or faster to move into the 850 Evo performance tier. I'm a bit disappointed that it doesn't have that kind of performance, but more disappointed still that it's not even priced properly for its performance level.

    Price drops in retail can always fix that, admittedly, but there's really not much to get excited about here. I don't understand why Micron thought this was the way to introduce their shiny new 3D NAND.
  • cknobman
    Not cheaper.
    Uses more power.
    No improvement on endurance.

    Am I missing anything major here?

    I just dont see anything that is purchase worthy here.
  • Lkaos
    Expect many improvements on the next Firmware release...