1.    14 Apr 2017 #1
    Join Date : Aug 2015
    Posts : 1
    Windows 10 in Bootcamp

    Does my BitLocker Use hardware acceleration?

    Hi all,

    Recently I assembled my new computer, key specs for my question:

    • CPU Intel i7-7700K
    • MB ASUS ROG Strix Z270I
    • Samsung 500GB 960 EVO NVMe M.2

    One of the reasons why I bought Samsung 500GB EVO is because I red that it supports hardware encryption and i thought all I need to do is to enable encryption in Bios. I appeared that not all the motherboards support Self-encrypting drives, particularly motherboard I've got does not have and option to set SSD password.

    Well, I was disappointed but my research has shown that BitLocker, built-in Microsoft tool should support SSD's hardware's capabilities of encryption and supposed to use hardware-backed encryption when I use BitLocker with no performance impact.

    So I encrypted both my partitions (C and D drives, located on the same 960 EVO drive). It looks like it works fine so far: I need to enter password just once before Windows boot and for drive D I enabled auto-unlock feature, so from user point of view it works seamlessly.

    The only question I got is performance impact

    So trying to figure out is my BitLocker really uses hardware acceleration and check is there really no performance impact I measures SSD speed with CrystalDiskMark, and results little confused me:

    First, couple screens before I enabled BitLocker (actually screens were taken couple weeks ago)

    Click image for larger version. 

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    And now screens after I enabled BitLocker:

    Click image for larger version. 

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    As you can see:


    • Seq Q32T1 is down from ~31000 to ~28000
    • 4K Q32T1 is down from ~800 to ~620
    • Seq is Up from ~1500 to ~1800 (!)
    • 4K is Up from ~35 to ~40+ (!)


    • Seq Q32T1 is up 1600 to 1700
    • 4K Q32T1 is ~600 to 830 (!)
    • Seq is about the same or slightly higher
    • 4K is about the same

    UPD: I noticed that I forgot to test drive C after BitLocker was enabled, so adding the screen.
    Interestingly enough, it shows much better Seq Q32T1 speed than drive D

    Click image for larger version. 

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    So, I do not understand:

    • Why some tests dramatically dropped while other dramatically improved?
    • It is still not clear to me, does BitLocker use hardware encryption or not (uses CPU)
    • Should I think about these drops as about performance degradation or not (because I also got some improvement)?

    With this result, honestly, I do not think I will see the any difference, because anyway these numbers much higher than I get on other computers with SSD, for example my work laptop, brand new Dell XPS 15 (with no BitLocker) is not even close:

    Click image for larger version. 

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    But anyway, those questions above do not let me rest,
    can someone make sense for me out of it?

    Last edited by jfog; 14 Apr 2017 at 02:06.
      My ComputerSystem Spec


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