The next-gen MacBook Pro with Retina Display Review
by Anand Lal Shimpi on June 23, 2012 4:14 AM EST- Posted in
- Mac
- Apple
- MacBook Pro
- Laptops
- Notebooks
Thunderbolt Performance
Apple’s 2011 Macs were the first to enjoy Thunderbolt, an interface co-developed with Intel that carries PCIe and DisplayPort over a single cable. As it derives most of its revenue from mobile, Apple wasted no time in bringing its Thunderbolt Display to market. A single Thunderbolt cable could bring Gigabit Ethernet, Firewire 800, high-speed mass storage, external audio and display to an otherwise IO-deprived MacBook Air.
At a high level, Thunderbolt is pretty easy to explain. The current implementation of Thunderbolt pairs four PCIe 2.0 lanes with DisplayPort, offering a maximum bandwidth of 2GB/s in either direction in addition to DP bandwidth. The Thunderbolt interface itself can deliver 10Gbps of bandwidth in each direction, per channel. The physical Thunderbolt port is compatible with mini DisplayPort to allow for the use of mini-DP displays as well as Thunderbolt chains. Each Thunderbolt port can carry up to two Thunderbolt channels, although one channel is typically reserved for DisplayPort duties.
In the past we measured a maximum of 1GB/s of unidirectional bandwidth for a single Thunderbolt channel in addition to video bandwidth over DisplayPort. There’s no shipping device that will deliver this sort of performance, I needed to outfit a Promise Pegasus with a handful of SSDs to truly saturate the bus.
In the 2012 Macs Apple, like the rest of the PC industry, has switched to using Intel’s 2nd generation Thunderbolt controllers codenamed Cactus Ridge.
The Retina MacBook Pro uses a four-channel Cactus Ridge controller and drives two Thunderbolt ports with it. Each port can drive a mini-DP display or a Thunderbolt chain with a mini-DP/Thunderbolt Display at the end of or in it. The rMBP can actually drive a fourth panel (counting the integrated Retina Display) via the integrated HDMI port although that’s not an officially supported configuration.
Unlike most other implementations, Apple hangs the Cactus Ridge controller off of the Ivy Bridge CPU rather than the PCH. The GeForce GT 650M in the system only gets the use of 8 PCIe 3.0 lanes instead of the full 16, but with PCIe 3.0 this is not an issue (it wouldn’t be an issue with PCIe 2.0 either to be honest).
I performed the same test as before to test if maximum bandwidth has gone up since switching to Cactus Ridge. Initial results remained unchanged, I was able to get north of 900MB/s to an array of SSDs in the Pegasus connected to a single Thunderbolt port. Now with two Thunderbolt on the rMBP however I was able to create a second chain of devices. I only have a single Pegasus so I resorted to chaining a LaCie Little Big Disk (SSD) and Elgato Thunderbolt drive. The combination of the two isn’t anywhere near as fast as the SSD array in the Pegasus but it allowed me to push the limits of the controller even more:
1380MB/s, over copper, to the rMBP. I suspect if I had another Pegasus SSD array I’d be able to approach 1800MB/s, all while driving video over the ports. Apple may limit the internal storage expansion of the rMBP but you still have a path to expansion for storage of large media files and other archives. And it’s very fast.
Unfortunately Thunderbolt behavior is still not perfect, although it is improved compared to previous Macs. If you write to Promise’s Pegasus for long enough while playing audio through Apple’s Thunderbolt Display you will still drop audio frames. Subjectively it seems to take longer to trigger this phenomenon but it does still happen. On my early 2011 MacBook Pro the problem has gotten so bad that I’ll even drop other USB packets for devices connected to the Thunderbolt Display. If I’m writing to the Pegasus I’ll miss keystrokes and the mouse will jump around until the high-speed write is complete. So far I haven’t had anything this bad happen on the Retina MBP but it took a while for this behavior to manifest on my early 2011 model so we’ll see what happens. I’m not sure what the fix will be for these types of issues as it seems there’s no good quality of service assurance for PCIe devices residing on Thunderbolt. As Thunderbolt was supposed to be as transparent as possible, it’s not surprising that even QoS overhead is nonexistent but it’s something that is clearly necessary. I’m not sure this is Apple’s fault as I’ve seen similar behavior under Windows. I suspect it’s something that Intel is going to have to figure out a way to address.
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OCedHrt - Sunday, June 24, 2012 - link
1) That's probably Canada. It is $1599 base in US for a while now and I got mine for $1100 after tax.2) Another Canada thing. But I agree, Sony is too inflexible.
3) That is by design. There is a video online with an interview where they explain it. This means you can grab your laptop by the screen and not risk damaging the hinges / screen. If you grabbed your MBP Retina by the display I'd be wary of breaking it.
ThreeDee912 - Saturday, June 23, 2012 - link
There's more to a computer than its hardware spec sheet.You can rattle off a laptop spec sheet with a good CPU, GPU, SSD, screen, etc., but if they're not integrated very well with everything else, or have mediocre software support, you can't always take advantage of those specs without some tacky workarounds.
gstrickler - Sunday, June 24, 2012 - link
^^^ I'll second that. Also, the right balance of specs matters more than "this spec is greater than that spec".If the keyboard, trackpad, or display sucks, you'll hate the computer no mater what the specs say. If it's too fragile, or heavy, or cumbersome, you won't want to carry it. If the software is slow and bloated, it won't matter that you've got 8GB RAM and a quad core i7, it can still feel sluggish.
The satisfaction with a computer is far more than just it's specs, or individual components, or even it's operating system. It's having the right combination of everything.
OCedHrt - Sunday, June 24, 2012 - link
1) This is dependent on user. i don't care about the 1" vertical, it's really the # of pixels that matter.2) The previous Z had discrete built in. The purpose of making it external is to achieve the 2.5 lb form factor. Sony once had a 11" 1.6 lb netbook. That is literally the holy grail in terms of weight for a portable laptop. The move to external discrete is really a step in that direction.
3) You can output more than 1920x1080 on HDMI.
4) 15" is too big for me, even at 2.5 lbs. Not everyone wants a huge screen on their lap - that's why I have a monitor on the desk.
5) Yes, at 2.5 lbs and 13", there's limited space for heat dispersion.
maratus - Sunday, June 24, 2012 - link
Unfortunately, Z tops at 1920x1200 through HDMI or single link DVI on the dock station. It was a dealbraker. Now rMBP ability to drive 2x 2560x1600 and 1x 1920x1200 is simply overkill for me, I'm still confused why did Sony stuck with HDMI only and didn't even bother to provide DP, mDP or 2L DVI as a second port.OCedHrt - Monday, June 25, 2012 - link
That's typical Sony (Japanese) stupidity.Chava - Friday, June 29, 2012 - link
That's typical Japanese stupidity...Yeah for some reason you thought that was acceptable.
Solandri - Saturday, June 23, 2012 - link
The chassis isn't thinner than the 13" 2010 MBP (it tapers from 1.0-1.3" vs the MBP's 0.95"). Its other two dimensions are smaller though (12.4" x 8.3" vs 12.8" x 8.9"), and it's lighter (lighter than the 2010 Macbook Air in fact) at 2.9 lbs (some models were 3.04 lbs, never figured out why). Sony managed this by using a lot of carbon fiber and a really thin screen. So it's not as stiff as the solid block of aluminum that the MBP used. But the keyboard bezel is solid aluminum making it very stiff.http://asia.cnet.com/sony-vaio-z-sports-worlds-fir...
http://www.pcpro.co.uk/reviews/laptops/355384/sony...
Here's the only marketing brochure I could find for the model being discussed (in French):
http://www.mgmi.fr/docs/pdfprod/VPC-Z11Z9E-B.pdf
OCedHrt - Sunday, June 24, 2012 - link
That's the 2008 Z. 2008. The 2011 Z is a non tapered design:13.0" x 0.66" x 8.27" (WxHxD)
330mm x 16.8mm x 210mm
The MBP is 50% thicker than the Z. It's understandable given that it is 15" instead of 13".
Freakie - Sunday, June 24, 2012 - link
http://www.tomshardware.com/news/sony-vaio-z-quad-...Here you go. THIS is true innovation. Sony did amazing work with this version of the Z to get all the functionality of a bigger laptop into a tiny package. It is even more impressive when you think about how old, hot, and power hungry the CPU/GPU was back then. Sony has innovated much more in the laptop industry than Apple has, in my opinion. Though I still wouldn't want a Sony like this just like I wouldn't want an Apple like the rMBP (user upgradability and repairability is virtually non-existant, which is an instant deal breaker for me, it was hard enough buying a laptop with a 540M integrated onto the mobo, could never buy a laptop that didn't even let you upgrade storage)
Here's a more detailed teardown: http://translate.google.com/translate?js=y&pre...