SSD Performance

Last year's MacBook Air was the first Mac to ship without a mechanical hard drive or an option to install one. Using a custom form factor, Apple partnered with Toshiba (and later Samsung) to build value SSDs for the MacBook Air line.

Although Apple has tested solutions from Intel, Marvell and SandForce, to date it hasn't opted to ship any of them to market. Toshiba and Samsung offer much better pricing and don't mind being silent members of the supply chain. There are also reliability benefits. While Toshiba and Samsung may not perform as well as the aforementioned controller makers, they've definitely had fewer issues.

My 13 had a Toshiba based drive while my 11 had a Samsung drive. You can tell what controller you have by looking at the model string in a System Report from your machine. The SM prefix indicates a Samsung drive while the TS indicates Toshiba:

Both controllers are limited to 3Gbps operation (neither company has released a 6Gbps controller) but performance does vary pretty significantly between the two:

2011 MacBook Air SSD Performance Comparison
  4KB Random Read (QD3) 4KB Write Read (8GB LBA Space QD3)  128KB Sequential Write 128KB Sequential Read
13-inch MacBook Air (Mid 2011) - Toshiba SSD 18 MB/s 1.65 MB/s 204.2 MB/s 189.5 MB/s
11-inch MacBook Air (Mid 2011) - Samsung SSD 44.6 MB/s 27.2 MB/s 258.0 MB/s 234.4 MB/s
11-inch MacBook Air (Late 2010) - Toshiba SSD 31.1 MB/s 2.49 MB/s 147.0 MB/s 113.0 MB/s

The Samsung drive has much better random and sequential performance, maxing out the 3Gbps interface when it comes to sequential reads.

In regular use I doubt you'd notice a huge performance difference between the two, but if you want the fastest drive you want the Samsung. Compared to last year's MacBook Air (Toshiba) you get a huge boost in sequential read/write performance.

Both drives support TRIM under OS X.

WiFi

Unlike other members of the 2011 Mac family, the MacBook Air retains a WLAN stack with 2 receive and 2 transmit antennas via the Broadcom BCM4322. The WLAN solution in the Air is capable of up to two simultaneous spatial streams, topping out at 270Mbps.

In practice this results in peak performance over 802.11n at around 128.8Mbps. Testing at the same distance I tested the MacBook Pro and iMac at, the results drop to 116.8Mbps.

802.11n Network Performance Comparison
  27-inch iMac (Mid 2011) 15-inch MacBook Pro (Early 2011) 13-inch MacBook Air (Mid 2011) 11-inch MacBook Air (Mid 2011)
Peak Network Transfer Speed 150Mbps 133Mbps 116.8Mbps 116.8Mbps

The new Air also supports Bluetooth Low Energy, although without any Bluetooth LE devices on hand I was unable to test the feature.

The Display: Better than Most, Not as Good as the Pro CPU Performance: A Huge Upgrade
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  • mschira - Friday, July 29, 2011 - link

    well you are not thinking apple enough for this. saving 100$ is no reason accepting a mess on your table...
    besides who sais you need to toss the display when the gfx is outdated? what's keeping you from connecting the display via A dedicated GPU box once the internal GPU becomes to slow?
    M.
    Reply
  • darwinosx - Saturday, July 30, 2011 - link

    In the display? So when the card is obsolete you get a new display? How about outside the laptop and the display but in between both. Reply
  • AJ Driver - Thursday, July 28, 2011 - link

    Thanks Anand :)

    The irony for me reading your review and others around the internet is the comparison in performance between these MBAs and other models (both new and old).

    My personal laptop is a 5, going on 6, year old Macbook and for what I use it for it's more than good enough. It's pretty incredible the way technology is advancing, and if the current pc stays the course I wait as long as I can before taking the leap.

    It's hard to deny the urge to upgrade though!
    Reply
  • Marand - Thursday, July 28, 2011 - link

    Well I thought I was finally clear that I was going to buy a MacBook Pro 13 but now I am not so sure.

    I mainly use my laptop for software development. My previous one was MacBook pro 2007 model which served me well.

    My issue with the pro line is that because of their weight, it just ends up becoming a desktop that I don't take with with me and always plugged into a large screen.

    But having the ability to put 8 gigs of ram and update the hard drive on the new MBPro is a nice option to have.

    I really hoped that apple was going to release MBAs with 8 gigs of ram at least and even if you can't upgrade the hard drive (although I heard you can with prev gen from OWC) you could always plug in bigger drives through thunderbolt if and when drives comes out.

    The big selling factor for the MBA for me was the weight. I figured it would be super easy to take with me where and when I want without treating it like a desktop.

    I know the MBAs are not targeted to developers. Ut I know plenty who were hoping for "more" from MBA

    So now I have a tough choice because the MBpro 15 with quad core and the hi res anti glare screen is packed with power even if it's heavier and likely has more long term capability.

    Oh well, can't have it all I guess...
    Reply
  • A5 - Thursday, July 28, 2011 - link

    If the 15" MBP is too heavy for you, you may want to get a more supportive bag or something. I would've killed for a 5.6lb 15" laptop 8 years ago :P Reply
  • Uritziel - Thursday, July 28, 2011 - link

    Remember, you're not supposed to carry it around attached to your ear lobe :)

    I carried a 17-inch DTR laptop that weighed about 10 lbs. around campus for a year, so 5.6 lbs. sounds light to me too. I consider battery life as the main metric of portability after weight hits that 5 lbs. mark.
    Reply
  • crimson117 - Thursday, July 28, 2011 - link

    >The only exception is if you're just going to spend your time doing very basic tasks on the machine and plan on upgrading again in a year or two. If that's the case save your money and enjoy a 4GB version with Ivy Bridge next year.

    People who can afford a new MacBook Air every time a new one comes out aren't going to be worried about saving their money on a ram upgrade :)
    Reply
  • steven75 - Thursday, July 28, 2011 - link

    Apple hardware has incredible resale value, so it's actually easier to do than you think. Reply
  • Uritziel - Thursday, July 28, 2011 - link

    Don't forget that if you buy a laptop for $2000 today and sell it at that great Apple resale value of say $1000 (numbers are random) in a few years when you're ready to upgrade, the laptop did NOT cost $1000 in the end.

    Adding on the effort required to resell it, that rationale makes a lot less sense than some people claim.
    Reply
  • Rasterman - Wednesday, August 03, 2011 - link

    I'm looking at upgrading right now so I looked up the resale value of mine. I bought a new MB for $1150 in 2008, used prices are $500-$800 right now, I expect to sell mine north of $700 since it is in brand new condition as I only used it as a dev machine when porting and it has seen very little use. So my expected resale value is 61% after 3 years which is pretty damn good IMO. Reply

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