Some Quick Comparative CrystalDiskMark Results

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A few weeks ago, I built a new Intel Skylake desktop system that I am going to start using as my primary workstation in the near future. I have some details about this system as described in Building a Z170 Desktop System with a Core i7-6700K Skylake Processor. By design, this system has several different types of storage devices, so I can take advantage of the extra PCIe bandwidth in the latest Intel Z170 Express chipset, and do some comparative testing.

The latest addition to the storage family is a brand new 512GB Samsung 950 PRO M.2 PCIe NVMe card that just arrived from Amazon yesterday afternoon. As of now, here is the available storage in this system:

  1. (2) 512GB Samsung 850 PRO SATA III SSDs in RAID 1 (using the chipset RAID controller)
  2. (1) 512GB Samsung 950 PRO M.2 PCIe 3.0 NVMe card in an Ultra M.2 PCIe 3.0 x4 slot
  3. (1) 400GB Intel 750 PCIe NVMe card in a PCIe 3.0 x16 slot
  4. (1) 6TB Western Digital SATA III hard drive in a SATA III port

Since I have an NVidia GeForce GTX 960 video card in one of the PCI 3.0 x16 slots, both that slot and the PCI 3.0 x16 slot that the Intel 750 is using will go down to x8 (which means 8 lanes instead of 16 lanes). The Intel Z170 Express chipset supports 26 PCIe 3.0 lanes, so you need to think about what devices you are trying to use. This system has Windows 10 Professional installed, so it has native NVMe drivers available from Microsoft.

I did some quick and dirty I/O testing today with CrystalDiskMark 5.02. The two NVMe devices are both using the native Microsoft NVMe drivers from Windows 10. As you can see below, both the Samsung 950 PRO and the Intel 750 PCIe NVMe cards have tremendous sequential and random I/O performance!

Device Sequential Reads Sequential Writes Random Reads Random Writes
512GB Samsung 950 Pro 2595 MB/s 1526 MB/s 171755.6 IOPS 104801.3 IOPS
400GB Intel 750 2369 MB/s 1081 MB/s 177938.0 IOPS 151642.1 IOPS
512GB Samsung 850 Pro 1104 MB/s 532 MB/s 100420.4 IOPS 60765.1 IOPS
6TB WD Red HD 176 MB/s 170 MB/s 386.7 IOPS 448.2 IOPS

Table 1: Sequential and Random Results (Queue Depth 32, 1 Thread)

Keep in mind that the two Samsung 850 PRO SSDs are using hardware RAID1, which seems to help their sequential read performance, and that the two NVMe devices are both using the native Microsoft NVMe drivers, which may be hurting their performance somewhat.


Figure 1: 512GB Samsung 950 Pro M.2 PCIe NVMe Results


Figure 2: 400GB Intel 750 PCIe NVMe Results


Figure 3: 512GB Samsung 850 Pro SATA 3 (RAID 1) Results


Figure 4: 6TB Western Digital Red Results

6 thoughts on “Some Quick Comparative CrystalDiskMark Results

  1. Hey,

    Just wanted to thank you for the disk benches. I recently built a similar system, and it was helpful to have a comparison!


  2. Thanks for posting, very informative article. It helped me to know if my system was OK.

    1. It shows up in a tooltip when you hover over the random results in the GUI. It also is present with more detail if you copy the results to text, and paste them into a text editor.

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