HD Tune Pro - Sequential Performance
Version and / or Patch Used: 4.55
At this time, there are only two products on the market using PCIe based M.2. Later in the year that will change when Marvell releases a PCIe 2.0 x4 controller code named Altaplus, but for now, the Marvell PCIe 2.0 x2 and the Samsung XP941 PCIe 2.0 x4 are the only game in town.
The Samsung XP941 is clearly the performance leader in the PCIe M.2 category, with the 512GB model being the fastest. The 256GB model we're focusing on today isn't much slower, and when it comes to reading data, all three XP941 drives are very fast.
Writing data is where we see the largest separation between the three XP941 capacity sizes. The 512GB model delivered an average sequential write speed of 738 MB/s and the 256GB model averaged 707.3 MB/s in our test using 64KB blocks. The 128GB XP941 only managed to write 450 MB/s in this test. That's on par with the fastest SATA III SSDs on the market today.
HD Tach - Sequential Write Performance after Random Writes
Version and / or Patch Used: 22.214.171.124
After running the XP941 256GB through a reasonable number of random and sequential write tests to push the drive past FOB state, we ran HD Tach. In this test, we use 128KB sequential data to see the performance roll off with garbage collection working.
The XP941 retains the high read performance we saw in the previous test, but the drive drops to around 500 MB/s sequential write speed. After the drive writes 50% of the capacity all at the same time, the sequential write speed drops down to just over 100 MB/s. It's rare for anyone to write over 100 GB of data in one sitting as fast as possible, but this is what happens when you do.
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