Corsair MP400 Review – Up to 8TB of FAST SSD

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This is the Corsair MP400, a QLC or quad level cell based NVME SSD that you can buy in up to an 8TB capacity. It’s also remarkably fast, so what’s the catch? Lets find out, but first, if you haven’t already, consider subscribing for more videos every Monday, Wednesday and Friday!

The MP400 is an interesting one. It’s based on QLC flash instead of the more common TLC (three level cell) drives like their own MP510. QLC is great for storage density, which explains the monstrous 8TB capacity available in such a tiny form factor, and yes it’s a standard 2280 M.2 drive. But QLC has some downsides. It’s generally much slower to access and wears out quicker than TLC drives meaning, normally, a slower drive with a shorter life span.

The way most people, including Corsair, get around the speed issue is by using an SLC (single level cell) cache, where as long as you are only writing the 4-500GB it takes to fill the cache on this 2TB model at a time, you never need to see how slow the QLC is. But, if you happen to fill it more than that you see the pretty naff performance – just 200MB/s. That is faster than a hard drive, but not by much. Of course, that sort of performance drop only happens after you write half a terabyte of data to it in one go which is a fairly niche use case but an important one to know.

The other side of the QLC coin is lifespan – again this is unlikely to be a real cause for concern but it’s important to know anyway. The MP400, this 2TB model anyway, is rated for just 400TBW. That may sound like a lot, filling the drive 200 times over before it’s expected to start failing, but for context, Corsair’s own MP510 2TB drive has a rating of 3120TBW. Yeah, that’s a big difference.

And sadly it gets worse for Corsair. The Sabrent Rocket Q, also a QLC SSD and one I reviewed recently, has a rating of 530TBW for it’s 2TB drive, a fair margin more than the MP400, and all for a sizable amount less money. It also performs almost identically too, which speaking of that lets take a look at the performance.

Starting with the synthetic results, you can see it does a pretty good job of hitting the PCIe Gen 3 bandwidth limitation, especially on reads, with writes being around the 3GB/s mark with high queue depth or large transfer sizes, and surprisingly fast at lower queue depths and threads too.

In my file copy stress test, duplicating a large file set on the drive, it did fairly well to begin with hitting over 1GB/s for the first 90GB copy. When I ran it for longer, copying a total of 750GB, it filled the SLC cache and performance dropped off a cliff – and didn’t return again. When it dropped off, it stabilised at just 200MB/s, making for a rather slow experience.

With that said, it’s unlikely you as a regular person will ever write enough to the drive to see that lower performance bracket, or really be worried by the endurance rating. But, as contributing factors, they do suggest that buying the Sabrent version of this (as they both use the same Phison E12S controller) is a better deal seeing as you get more endurance rated, for at the time of filming, about 25% cheaper. I’ll leave links to both of them below.

One interesting note from the reviewers guide is that apparently “Linux is not compatible with this drive”. Not quite sure why, but a word of warning to any linux users who wanted this one.