Corsair's recent SSDs have all been based on Phison's turnkey SSD solutions, where Corsair specifies how the drive will look, but the internals of the drive are essentially identical to those of a dozen other brands. Using turnkey solutions like this is by far the easiest and least risky way for a brand to ship SSDs, but it leaves very little room for product differentiation. Corsair's Neutron XTi and Force LE SATA drives and their Force MP500 M.2 NVMe SSD don't offer anything unique under Corsair's sticker. The new Corsair Neutron NX500 uses the same Phison E7 controller as the MP500, but it aims to stand out from the crowd.

The Corsair Neutron NX500 is not the first retail Phison E7 SSD to use the PCIe add-in card form factor with a heatsink, but it is the first to reserve a very large spare area, leaving just 400GB usable space on our sample compared to the typical 480GB. This kind of high overprovisioning ratio is usually only found on enterprise SSDs intended for write-heavy workloads. We saw these oddball capacities with the Intel SSD 750, but there it was due in part to Intel's 18-channel controller compared to 4 or 8 channels on most consumer drives. The Corsair NX500 actually has substantially more overprovisioning than the Intel SSD 750.

The custom heatsink makes the Corsiar Neutron NX500 visually quite distinct as it carries typical Corsair styling cues. The PCIe bracket is perforated with triangular vents that match the Corsair ONE's side panels, while the rest of the drive is decked in variations on black. We know from our past testing of Phison E7 drives that the heatsink's role is more aesthetic than functional, but as the heaviest SSD heatsink I've yet encountered it should guarantee that the controller stays cool. The NX500 does not include any thermal pads between the heatsink and the flash memory, and there are no thermal pads between the drive and the backplate. The faux carbon fiber plastic shroud over part of the NX500's heatsink could theoretically detract from its cooling capacity, but the wattage of the Phison E7 chip is far too low to for that to matter.

The PCB under the NX500's heatsink is barely modified from the Phison reference design. It does actually bear Corsair's name, but the overall layout is identical to all the other Phison E7 PCIe cards we've seen, right down to the unpopulated solder pads for power loss protection capacitors—both cylindrical through-hole capacitors and surface-mount solid capacitors are provided for. A custom PCB half the size could have worked without making the board crowded. The flash is the usual Toshiba 15nm MLC. The NX500 is equipped with twice as much DRAM as is typical for a SSD with this much NAND flash.

Corsair Neutron NX500 Specifications Comparison
Capacity 400GB 800GB
Controller Phison PS5007-E7
NAND Flash Toshiba 15nm MLC
DRAM Cache 1 GB DDR3 2 GB DDR3
Sequential Read 2800 MB/s 2800 MB/s
Sequential Write 1600 MB/s 1600 MB/s
Random Read IOPS 300k 300k
Random Write IOPS 270k 270k
Form Factor PCIe x4 HHHL PCIe x4 HHHL
Write Endurance 698 TB (1 DWPD) 1396 TB (1 DWPD)
Warranty 5 years 5 years
Launch MSRP $319.99 $659.99

Quite unsurprisingly given the overprovisioning situation, the Corsair Neutron NX500 comes with a firmware version we have not previously encountered on other Phison E7 products. The NX500 ships with firmware version E7FM04.5, which I'll abbreviate as version 4.5. We've previously dealt with versions 1.0, 2.0 and 2.1, and an upcoming review will feature a 240GB drive using version 3.6.

An NVMe SSD in the PCIe add-in card form factor with a big heatsink and using MLC NAND is obviously a niche product for the high end of the market. It makes sense that Corsair's starting the NX500 line with 400GB and 800GB capacities while the more mainstream MP500 M.2 SSD ranges from 120GB to 480GB. Corsair rates the NX500 with a total write endurance of 698TB for the 400GB model (the same as their 480GB MP500) and 1396TB for the 800GB model, but the NX500 comes with a five-year warranty compared to the MP500's three years.

This review has two goals: to compare the NX500's overprovisioning and other firmware changes against earlier Phison E7 drives, and to compare the NX500 against the broader field of current NVMe SSDs with similar capacities. The other drives considered in this review includes:

AnandTech 2017 SSD Testbed
CPU Intel Xeon E3 1240 v5
Motherboard ASRock Fatal1ty E3V5 Performance Gaming/OC
Chipset Intel C232
Memory 4x 8GB G.SKILL Ripjaws DDR4-2400 CL15
Graphics AMD Radeon HD 5450, 1920x1200@60Hz
Software Windows 10 x64, version 1703
Linux kernel version 4.12, fio version 2.21
AnandTech Storage Bench - The Destroyer
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  • Kristian Vättö - Wednesday, August 16, 2017 - link

    There are numerous 8-lane enterprise SSDs already.
  • hlm - Wednesday, August 16, 2017 - link

    e.g. HGST FlashMAX III and HGST Ultrastar SN260 products are eight-lane devices.
  • The_Assimilator - Wednesday, August 16, 2017 - link

    Hey look, another SSD that has no reason whatsoever to exist!

    I don't understand why manufacturers don't, y'know, try to COMPETE with Samsung instead of re-re-releasing the same old, tired, slow controllers with slightly different but ultimately insignificant spins on them.
  • DanNeely - Wednesday, August 16, 2017 - link

    Because unless you have a billion dollars to spend and a few years to wait, you can't create your own controller. That means almost all of the other companies selling drives have to pick and choose between a handful of controllers made by Phison/etc. Until they recover from Samsung's blind siding them and design new higher performing architectures from the ground up none of them have anything in the same performance class. If what happened at the start of the market when Intel's controllers were unbeatable is any indication we should hopefully have competitive designs available in another year or so.
  • FunBunny2 - Wednesday, August 16, 2017 - link

    -- Because unless you have a billion dollars to spend and a few years to wait, you can't create your own controller.

    well, isn't a controller an implementation of physics and math? which is to say, unless something new happens with NAND chips (not just node size or xLC), may haps we've reached the one-true-answer to the controller problem? may be there's just no more there, there.
  • Samus - Wednesday, August 16, 2017 - link

    Wow. That was disappointing.
  • RaistlinZ - Wednesday, August 16, 2017 - link

    Current Newegg Prices:

    1. 500GB Samsung 960 Pro = $299.99
    2. 1TB Samsung 960 Pro = 600.82

    The NX500 has no reason to exist. The price needs to be cut in half to make it even REMOTELY attractive.
  • alpha754293 - Wednesday, August 16, 2017 - link

    I'm surprised you didn't bother comparing it against the Intel 750 Series 400 GB PCIe NVMe SSD.
  • Billy Tallis - Thursday, August 17, 2017 - link

    I had originally planned to include the 400GB 750, but some of the results from it looked funny and I decided it wasn't worth postponing the review for several days to re-test the 750. That drive's a pain to test, because I have to run each test twice in order to record the power on both the 3.3V and 12V lines, and the performance has to match between the two runs for the results to be valid.
  • alpha754293 - Friday, August 18, 2017 - link

    Depending on how you want to tackle/handle it.

    There are statistical methods available out there that even with noisy data (e.g. high standard deviations) that you can still use it to process data that might otherwise not make sense at first glance, on the surface.

    Course, that would also mean that care would need to be taking so that the tests in and of itself are repeatable.

    I only mention it because I would be VERY interested to see how this compared to the Intel 750 series.


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