All Flash Storage

As expected, the next-gen MacBook Pro ditches mechanical storage in favor of a MacBook Air style NAND + SSD controller on a custom PCB. Apple refers to this solution as all-flash storage.

Apple’s distinction between Solid State Drives (SSDs) and all-flash storage boils down to what form the storage comes in. If it’s a standard form factor device in a chassis, it’s a solid state drive. If it’s just NAND + controller on a PCB? Then it’s all-flash storage. I suspect it’s a nicer way of saying proprietary SSD but either way they are technically the same thing, just in different forms.


The Samsung PM830 based rMBP NAND flash storage card, image courtesy iFixit

My Retina MacBook Pro was the upgraded model with a 512GB SSD, featuring Samsung’s PM830 controller. This is the same controller as in the Samsung SSD 830, which I’ve long felt was the best pair for Mac users who wanted an SSD upgrade. I’m not sure if other Retina MBPs may come with Toshiba’s SandForce based drive instead. I have one of these drives in house for a review but that’ll have to wait until next week.

Although both the Samsung and Toshiba/SandForce controllers support full disk encryption, neither hardware based encryption is supported by OS X’s FileVault 2. When OS X encrypts your boot volume not all areas are encrypted (such as the recovery partition). While I know SandForce allegedly offers multiple encryption levels across a volume I’ve never seen either controller claim support for partially unencrypted volumes. In this case it looks like for Apple to take advantage of SSD controller based encryption it would need more flexible encryption support on the controller level. If I were an SSD controller vendor I’d be paying close attention to this requirement.

Both the Samsung and Toshiba controllers support 6Gbps SATA - as a result performance is significantly better compared to previous Apple branded SSDs. I borrowed a friend’s 2010 MacBook Pro which happened to have a Toshiba based SSD installed and ran it through our standard Iometer four-corners test suite. This was a well used drive and thus the performance is even worse than last year's MacBook Airs. The improvement in performance is astounding:

Apple SSD Comparison - 4KB Random Read (QD3)

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

The move to 6Gbps SATA is often associated with a huge bump in sequential transfer rates, but in this case Apple enjoys a significant increase in random speeds as well. Note that some of this improvement is going to be due to the fully populated configuration of the PM830 in the Retina MacBook Pro's SSD, but that shouldn't downplay the significance of the move to Samsung's latest controller. The previous generation controller used last year just wasn't very good, and the Toshiba alternative was even worse. This year, Apple finally has a good solid state story to tell.

Apple SSD Comparison - 128KB Sequential Read (QD1)

Apple SSD Comparison - 128KB Sequential Write (QD1)

How much of this are you going to be able to actually tell in day to day use of the system? The sequential transfer rates are most tangible when you are writing to or reading large files like movies to your drive. Obviously you need a source that's fast enough to hit these speeds. Although USB 3.0 can come close you're unlikely to have a USB 3.0 SSD that's as fast as the internal drive. Moving large files between your internal SSD and Promise's Pegasus R4/R6 is where you'll really appreciate this performance.

The random access improvements are likely overkill for most normal uses. Things like program launches, compiling, web browsing, and any other normal application IO will depend on a mixture of random and sequential IO. The key is to have good enough random IO performance to avoid becoming a bottleneck. I can safely say that the numbers we see here are more than enough.

While previous Apple SSDs were nice only from a convenience standpoint, at least the Samsung option in the Retina MacBook Pro is what I’d recommend even if Apple didn’t bundle it with the machine.

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  • wfolta - Sunday, June 24, 2012 - link

    I insisted on a 17" laptop since the 17" MBP came out, and used them right up until I got the 15" rMBP last week. I'll never turn back. I've got it turned up to "1920x1200 equivalent" right now, and so I get as much screen real estate in a machine that's way, way, WAY smaller and lighter. And the display is so good, I'm impressed every single time I use it.

    At first, that seemed too small. I started with the 1440x900, and the next day tried the next denser step and it was okay, and the next day went 1920x1200 and it's something you get used to fairly easily. Obviously, you couldn't use 1920x1200 on a 6" screen if you had the pixel density to pull it off, but I really don't see the need for a 17" screen anymore.

    (And I use a 30" screen at work, which this laptop could easily drive if that's what I want. Heck, I've read about people driving the internal screen, an HDMI screen, and two Thunderbolt screens with a video running on each simultaneously. You don't need a huge built-in screen.)
  • yvesluther - Sunday, June 24, 2012 - link

    I am wondering how I should connect my two Thunderbolt displays to my new Retina MacBook Pro?

    a) Should I chain both displays and use one Thunderbolt port

    or

    b) Should I hook each display to its own port?

    Thanks for any advice.
  • wfolta - Sunday, June 24, 2012 - link

    I'm pretty sure you will have to put each display on its own port. You'll be able to daisy chain other devices (disk drives, etc), but I think it's one display each for this laptop at least.
  • Constructor - Thursday, June 28, 2012 - link

    The "classic" MBPs support both displays on the same TB port, so I would expect that to work here as well. It's mostly just a question of convenient cabling, since the displays have TB daisy-chaining outputs anyway.
  • SJdead - Sunday, June 24, 2012 - link

    One issue though is how can the "retina display" [(FYI, 226 PPI is not comparable to the human eye which at 20/20 vision is 426 PPI) that's why I don't like Apple because they treat people like their dumb.] is that there is so much focus on the PPI.

    Ya, it's innovative (in a sense) as Apple knows how to market to the masses. But what about LED - IPS? That's a downgrade from older IPS displays. What about color contrast? Blacks/whites? What about billions of colors instead of millions? What about color accuracy and Adobe sRBG/RGB? What about glossy screens that cause over-saturated colors? Response time in MS?

    All the above mentioned are glaring oversights to the, "Best display I've ever seen..." comment. If that is the case, you should check out a variety of other displays.

    My point is that display resolution isn't everything, there are a lot of other factors that go into a good display. There are far better displays from 5+ years ago that will outperform and look more gorgeous that Apple's current 2012 model. All you have to do is go to Apple's website to see that good specifications are highlighted while poor specifications are not even mentioned.
  • wfolta - Sunday, June 24, 2012 - link

    You do realize that you can't make any statements at all about "retina" qualities based solely on PPI, right? "Retina display" is based on an angular measurement, so you need PPI at a specified viewing distance. And the rMBP meets that at its typical viewing distance.

    (On an anecdotal note, I work with video as a profession, so am very sensitive to pixels, etc, and this screen is gorgeous, density-wise.)

    You mention all of those "far better" displays from 5+ years ago... Were they in laptops, or were they expensive desktop options? What manufacturer has continued to make them since then? In fact, most everyone except Apple has headed towards the consumerized, 16:9 1920x1080 (1080p) screen size, which is 15% shorter than Apple's displays. Contrary to popular opinion, Apple has been holding out for the more useful, professional aspect ratio and resolution, while its competitors have chased the checkbox of "Play Bluray DVDs at HD resolution".

    In terms of your actual comments, the rMBP's display is in the top two or three laptop screens for contrast and blacks, basically falling a bit short (top 6-8) in white because Apple just couldn't pump up the brightness without compromising battery life too much. Color accuracy has dropped a bit from older MBP's. Still, the combination of perceivable features is the best most of us have ever seen outside of a calibrated desktop setup.
  • wfolta - Sunday, June 24, 2012 - link

    One thing to think about is that Apple's auto-switching between dedicated GPU and Intel graphics is a bit of a mystery. Some programs trigger the dedicated GPU and it's not clear why.

    For example, Eaglefiler (a terrific program) seems to trigger it, even though it's not a graphics heavyweight and even when it's hidden. With a program that you leave running all the time like that, it will drag down your battery life. The author is looking into this, but it's not clear what Apple API is the cause.

    In light of that, I'd highly recommend the gfxCardStatus, which monitors what programs trigger discrete graphics and which don't. It'll at least give you a clue that a program you wouldn't otherwise suspect may be shortening your battery life.
  • designerfx - Sunday, June 24, 2012 - link

    okay, so we're looking at a screenshot. 15 FPS in the most uncluttered situations with D3. Can you even imagine the FPS in a normal situation during the game, even on normal difficulty?

    Hint: we're looking at FPS in the 1-3 range, maybe 4 if you're lucky.

    Apple can deliver great displays but if we don't have performance to match then the only main use is photoshop.
  • Fx1 - Monday, June 25, 2012 - link

    If you have any brains you will bootcamp windows and game in there with usually 40% increase in FPS. No one games in OSX. Even OSX fanboys have better sense.
  • wfolta - Monday, June 25, 2012 - link

    I've said repeatedly in this thread that I get 20+ FPS in Normal Act III, with two or three dozen mobs onscreen. I've read at least one other report of 20+ FPS (perhaps this article mentions that in the text). And this is with settings mostly at max. Cut the res down to 1440x900 and drop a few settings to Medium and I think you could double the frame rate.

    So your speculation is wrong.

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