PCIe SSD Performance

I created a Boot Camp partition of around 120GB and ran our client iometer benchmarks to put the new PCIe SSD’s performance in perspective.

Peak random read performance is roughly comparable to the previous-generation Samsung controller. Random write performance took a bit of a hit but it's still more than fast enough for client workloads. Sequential speeds are much improved but the gains are really only visible at high queue depths. Low queue depth sequential transfers can’t be split up enough in order to really require PCIe.

Apple SSD Comparison - 4KB Random Read (QD3)

Apple SSD Comparison - 4KB Random Write (8GB LBA Space - QD3)

Apple SSD Comparison - 128KB Sequential Read (QD1)

Apple SSD Comparison - 128KB Sequential Write (QD1)

What does this mean in the real world? The new SSD is definitely snappier in system use. Wake from sleep is a bit quicker, as are application launches. The funny thing is that with the exception of high-speed Thunderbolt arrays, most external sources aren’t fast enough to even stress the new storage subsystem in the MacBook Air. Large file copies confined to the drive itself benefit a bit as well. I saw roughly 300MB/s reads and 300MB/s writes when copying a large dmg from/to the MacBook Air’s PCIe SSD (compared to roughly 200/200MBps on the old Samsung SATA SSD from the rMBP15).

If you have an external Thunderbolt array with at least a couple of drives, you should have no issues matching the MBA’s internal SSD performance.

Seeing as how this is our first experience with Samsung’s PCIe SSD controller, I wanted to get a feel for how the drive behaved under extended high queue depth random writes. I ran a modified version of our IO consistency test. The test was modified to run in a 91GB space on the MBA’s Boot Camp partition. I made sure to fill the rest of the drive completely, but the random writes were effectively constrained to 91GB of LBAs. When I get back from the UK I’m going to try setting up an external boot drive and will do some more extensive testing on the drive.

The IO consistency results, at least within a somewhat constrained space actually look really good. I have a feeling that Samsung might have improved its IO consistency story with this generation, but I’ll wait on saying for sure until I’ve had a chance to do some more work with the controller. For the vast majority of users however, solid random write performance like this over a 91GB space on a full drive is actually very good news.

A Custom Form Factor PCIe SSD 802.11ac: 533Mbps Over WiFi
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  • AKfaust - Friday, June 28, 2013 - link

    So I purchased one of the base units early this week and am very happy so far. The performance is great and surprisingly I can run Civ V, LOTRO, etc at some pretty decent settings without a hitch.
  • custompc - Thursday, July 4, 2013 - link

    XPS13 indeed a better option.
    http://custompcshop.net
  • darwinosx - Monday, July 8, 2013 - link

    No its cheap Dell junk with poor support and it run Windows.
  • Blindsay - Tuesday, July 16, 2013 - link

    So i would say the only thing that dissapoints me about the screen are the viewing angles. I find the resolution of 1440x900 quite fine for a screen of this size but i am spoiled by the viewing angles of my IPS screens. Other than that i am quite happy with my MBA so far (i7 8GB, 256GB)
  • Risas - Thursday, July 18, 2013 - link

    Macs vs Macs... what a usefulness comparisons. Is the Mac from 2013 better than the one from 2011? I hope so!

    When will you compare the ultrabooks in stores now against the Macs? Some comparison like "what you get for that price"... Maybe some people could find some good ideas for spending their money... Not just Macs against Macs as there was no other option in the world... inbreeding?
  • gentux - Friday, July 26, 2013 - link

    Good review. One thing I noticed was that the speakers are much better than on the 2011 MacBook Air. I have no idea if this was already improved in 2012 but the 2013 really rocks and actually has a nice bass. I think they haven't been stereo in the past.
  • lobisme11 - Tuesday, August 6, 2013 - link

    This computer is simply amazing if I could change on thing it would be to add retina display. However the screen resolution is still great! The battery dosen't last the 12 hours it is supposed to when editing movies/videos which is what I use it for. For typing/surfing the web the battery is great! Some times while editing a movie the computer freezes normally for about 30 seconds however it rarely ever has to be restarted when it freezes. Overall Simply Amazing! A definite Buy! Great phone support to. Buy a warranty Overall: 8.5/10
  • antonio22m - Saturday, August 10, 2013 - link

    Macbook Air is undoubtedly a very good notebook
    Price and lack of optical drive can affect a large number of users whose decision during the judgment can be negative so that they can decide to choose another manufacturer.
    Air is perfect and the best "second computer" that you can wish for.
    His task was not to be the main and only computer we can possess.
    If you want excellent laptop computer that will be able to carry it with you wherever you go, the Air is an excellent choice for perfectly reasonable size and more pronounced weight that barely exceeds one kilo.
    Take a look at this comparison at http://www.squidoo.com/apple-macbook-air-133 and You will see comparison to the another Apple laptops.Anyone considering purchasing this laptop needs to see the information in this chart.
  • strafejumper - Tuesday, August 20, 2013 - link

    I went to the apple store to get this haswell macbook air but the tn panel - while good for a tn panel - looked bad next to all the iphones, mini ipads, and ipads all around it
    To me an ultrabook should not have a tn panel - i couldn't buy it
    The Macbook pro 13" was too heavy (and i cannot wait for the impending refresh)
    It's really tough though because the windows ultrabooks (only 2 out so far - Sony Pro and Asus S7) have half the battery life of the macbook air.
    Half! My guess is this is mostly due to Mac OS and Mavericks isn't even out yet!
    If the Macbook air had an IPS I think it would be a slam dunk -
    As it is I think i'm going to be stuck with a crappy 6hr Sony Vaio
  • thinkpanda - Friday, September 13, 2013 - link

    Apple delivered an update of OS X (10.8.5) which claim to fix the file transfer speed with 802.11ac network. Would Anand update the test result with that path?

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