The Drives

Corsair surprised us all at Computex this year when they announced their Neutron and Neutron GTX SSDs based on a so-far relatively unknown Link A Media Devices (LAMD) controller. While LAMD was new to the consumer-grade SSD controller market, the company had been making controllers for hard drives and enterprise SSDs for years, so the LM87800 found inside Neutron SSDs wasn't LAMD's first attempt in the storage world. The experience LAMD has gathered in the enterprise world is definitely visible in the LM8700 because even though its LAMD's first consumer-grade controller, it was not dwarfed by SandForce or Marvell.

Overall we were pleasantly surprised with the Neutron when we first reviewed it. There's always room for more competition because not only will it lead to lower prices, it will also provide the market with better products. Lately the consumer SSD market has been flooded with SandForce based SSDs, so it was very refreshing to see something new for a change.

Corsair only sampled the 240GB Neutron and Neutron GTX at the time of the release, which is a common practice among manufacturers. Stock is obviously limited and manufacturers want to get as many units as possible to retailers because ultimately that is what generates them revenue and profit. 240/256GB is usually the sweet-spot in terms of price and performance; smaller capacities perform worse due to less NAND die and higher capacities don't bring any improvements because the bottlenecks are elsewhere (*cough* SATA 6Gbps).

Now, three months later, Corsair finally sent us the rest of the available capacities. Testing different capacities is crucial, especially if the drive has a new controller, because controllers and firmware are designed differently and some design choices result in bigger differences between smaller and larger capacities. For example, the 128GB Vertex 4 is almost as fast as its 256GB and 512GB siblings, whereas the difference between 120GB and 240GB Vertex 3 ranges from negligible to as much as 50-75% (e.g. in write-heavy scenarios). Here's the quick rundown of the various drives.

  Neutron Neutron GTX
Capacity 120GB 240GB 120GB 240GB 480GB
Raw NAND Capacity 128GiB 256GiB 128GiB 256GiB 512GiB
NAND Micron 25nm synchronous MLC Toshiba 24nm Toggle-Mode 2.0 NAND
Cache 128MB 128MB 128MB 128MB 256MB
Sequential Read 555MB/s 555MB/s 555MB/s 555MB/s 555MB/s
Sequential Write 211MB/s 370MB/s 330MB/s 511MB/s 511MB/s
4KB Random Read 50K IOPS 85K IOPS 80K IOPS 85K IOPS 90K IOPS
4KB Random Write 86K IOPS 87K IOPS 90K IOPS 90K IOPS 85K IOPS
Warranty 5 years

Toshiba's Toggle-Mode NAND is quite a bit faster than Micron's synchronous ONFi NAND as you can see in the table above. The 120GB Neutron is substantially slower than the 120GB Neutron GTX and there is also a noticeable difference at the capacity of 240GB. Corsair isn't offering a 480GB Neutron so if you're looking for a drive bigger than 240GB, you'll have to pay the premium for the Neutron GTX. Quite a few manufacturers, such as Intel and Plextor, have similar product schemes where only the high-end model offers the highest capacities (Intel SSD 330 tops out at 240GB and Plextor M5S at 256GB).

Comparison of NAND Interfaces
  ONFi Toggle-Mode
Manufacturers IMFT (Intel, Micron, Spectec), Hynix Toshiba/SanDisk, Samsung
Version 1.0 2.0 2.x 3.0 1.0 2.0
Max Bandwidth 50MB/s 133MB/s 200MB/s 400MB/s 166MB/s 400MB/s

The Toggle-Mode interface can currently provide up to twice the bandwidth of ONFi. The interface alone isn't the reason for the difference in performance; Toshiba's NAND is also considerably faster when it comes to program times based on the data I've seen, which would explain why only write speeds are slower on the Neutron.

Price Comparison (12/18/2012)
  120/128GB 240/256GB 480/512GB
Corsair Neutron GTX $130 $225 $455
Corsair Neutron $120 $190 N/A
Corsair Force GS N/A $200 $410
Corsair Force GT $130 $220 $440
Plextor M5 Pro $125 $200 $460
Plextor M5S $105 $200 N/A
Crucial m4 $110 $190 $383
Intel SSD 520 $129 $220 $445
Intel SSD 330 $113 $179 N/A
Samsung SSD 840 Pro $139 $260 $577
Samsung SSD 840 $100 $169 $315
OCZ Vector $150 $270 $555
OCZ Vertex 4 $108 $210 $458

Neither the Neutron or the Neutron GTX is the cheapest SSD available, but the pricing is still fair. Compared to the OCZ Vector or Samsung SSD 840 Pro, the Neutron GTX is actually quite a bit cheaper, although performance is at a different level as well. As always, prices fluctuate a lot so it's hard to draw any conclusions based on one day's pricing—it can be totally different in less than a week.

In fact, just to show you how prices fluctuate, here's the same table as above, only with prices from just over two weeks ago; I've italicized and bolded the differences, which you can see is about 80% of the SSDs we've listed. Sure, it's the Christmas season and so we're more prone than ever to price fluctuations, but in particular some of the newer drives (like the Samsung 840 500GB) as well as some of the older outgoing models (e.g. OCZ Vertex 4 and Intel 520) have seen some pretty heft price cuts. Be sure to shop around!

Price Comparison (12/1/2012)
  120/128GB 240/256GB 480/512GB
Corsair Neutron GTX $140 $230 $470
Corsair Neutron $120 $205 N/A
Corsair Force GS N/A $220 $450
Corsair Force GT $130 $220 $440
Plextor M5 Pro $130 $250 $460
Plextor M5S $110 $200 N/A
Crucial m4 $110 $200 $385
Intel SSD 520 $130 $250 $490
Intel SSD 330 $115 $200 N/A
Samsung SSD 840 Pro $194 $270 $600
Samsung SSD 840 $105 $179 $392
OCZ Vector $160 $290 $570
OCZ Vertex 4 $140 $236 $475

 

Inside the Drives

  NAND Type NAND Configuration NAND Part Number
Neutron      
120GB Micron 25nm synchronous MLC 16x 8GiB packages 29F64G08CBAAB
240GB 16x 2x8GiB packages 29F128G08CFAAB
Neutron GTX      
120GB Toshiba 24nm Toggle-Mode MLC 8x 2x8GiB packages TH58TEG7D2HBA4C
240GB 8x 4x8GiB packages TH58TEG8D2HBA4C
480GB 8x 8x8GiB packages TH58TEG9D2HBA4C

Neutron GTX 120GB and 480GB

In general, the only difference between the various capacities is the amount of cache and NAND per die. The 480GB model is the only one with 256MB (two 128MB chips) of cache; other models have 128MB. Both DRAM caches are DDR2-800 like in the 240GB Neutron GTX, but Corsair has opted for Micron's DRAM in the 480GB model whereas the 120GB and 240GB models use DRAM from Samsung.

LM87800—The heart of Corsair's Neutron series

Micron's ONFI NAND in 120GB Neutron

Test System

CPU

Intel Core i5-2500K running at 3.3GHz (Turbo and EIST enabled)

Motherboard

AsRock Z68 Pro3

Chipset

Intel Z68

Chipset Drivers

Intel 9.1.1.1015 + Intel RST 10.2

Memory G.Skill RipjawsX DDR3-1600 2 x 4GB (9-9-9-24)
Video Card XFX AMD Radeon HD 6850 XXX
(800MHz core clock; 4.2GHz GDDR5 effective)
Video Drivers AMD Catalyst 10.1
Desktop Resolution 1920 x 1080
OS Windows 7 x64

 

Random & Sequential Read/Write Speed
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  • Sabresiberian - Wednesday, December 19, 2012 - link

    Always glad to see someone step in with a different controller than the majority have, and see it perform very well. Good job Corsair!

    I have to say, the price/performance is excellent and I'm very tempted to replace the 840 Pro as the choice for my next build. That being said, what I really hope it does at this point is cause Samsung to drop the price of the 840 Pro lineup.
    Reply
  • extide - Wednesday, December 19, 2012 - link

    I wouldn't expect much of any change-up in the market as these drives have already been out for a few months. They are not brand new at this point. Reply
  • Sabresiberian - Thursday, December 20, 2012 - link

    Heh well I wasn't implying there would or even should be any kind of change-up, I'm just saying I want competition to stay alive as long as possible, and if everyone jumps onto one controller from one source the only competition point will more rapidly come down to just price.

    The differences are basically controller, NAND, and price, in today's consumer market, and frankly I'd like to see controllers in particular get a lot better. They are good at pumping out high peak numbers, but consistency and even reliability just aren't there yet, in my opinion. (I mean reliability in terms of getting a bug-free controller, not in terms of life of the SSD.)
    Reply
  • Flying Goat - Thursday, January 03, 2013 - link

    Hmmm...The Samsung 840 Pro 512GB has dropped by at least $100 in the past month. Not making any claims about the reason for that. Reply
  • Drazick - Wednesday, December 19, 2012 - link

    Hi,
    Why don't you update your Google+ Page?

    Thank You.
    Reply
  • nathanddrews - Thursday, December 20, 2012 - link

    What's Google+? Reply
  • Snotling - Thursday, December 20, 2012 - link

    google it, you'll know. Reply
  • Sabresiberian - Thursday, December 20, 2012 - link

    Google+ is an even less secure version of Facebook.

    If you like Google laying claim to every word you say, then by all means sign up for it.
    Reply
  • blanarahul - Wednesday, December 19, 2012 - link

    When are you going to review lower capacity models of 840 Pro and 840?

    Nice review though.
    Reply
  • Kristian Vättö - Thursday, December 20, 2012 - link

    I have a 128GB and 512GB 840 Pros but we are still waiting for additional 840 capacities. Reply

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