The Platform

From a design perspective, Carrizo is the biggest departure to AMD’s APU line since the introduction of Bulldozer cores. While the underlying principle of two INT pipes and a shared FP pipe between dual schedulers is still present, the fundamental design behind the cores, the caches and the libraries have all changed. Part of this was covered at ISSCC, which we will also revisit here.

On a high level, Carrizo will be made at the 28nm node using a similar silicon tapered metal stack more akin to a GPU design rather than a CPU design. The new FP4 package will be used, but this will be shared with Carrizo-L, the new but currently unreleased lower-powered ‘Cat’ core based platform that will play in similar markets for lower cost systems. The two FP4 models are designed to be almost plug-and-play, simplifying designs for OEMs. All Carrizo APUs currently have four Excavator cores, more commonly referred to as a dual module design, and as a result the overall design will have 2MB of L2 cache.

Each Carrizo APU will feature AMD’s Graphics Core Next 1.2 architecture, listed above as 3rd Gen GCN, with up to 512 streaming processors in the top end design. Memory will still be dual channel, but at DDR3-2133. As noted in the previous slides where AMD tested on DDR3-1600, probing the memory power draw and seeing what OEMs decide to use an important aspect we wish to test. In terms of compute, AMD states that Carrizo is designed to meet the full HSA 1.0 specification as was released earlier this year. Barring any significant deviations in the specification, AMD expects Carrizo to be certified when the final version is ratified.

Carrizo integrates the southbridge/IO hub into the silicon design of the die itself, rather than a separate on package design. This brings the southbridge down from 40nm+ to 28nm, saving power and reducing long distance wires between the processor and the IO hub. This also allows the CPU to control the voltage and frequency of the southbridge more than before, offering further potential power saving improvements.  Carrizo will also support three displays, allowing for potentially interesting combinations when it comes to more office oriented products and docks. TrueAudio is also present, although the number of titles that support it is few and the quality of both audio codecs and laptop speakers leaves a lot to be desired. Hopefully we will see the TrueAudio DSP opened up in an SDK at some point, allowing more than just specific developers to work with it.

External graphics is supported by a PCIe 3.0 x8 interface, and the system relies on three main rails for voltage across the SoC which allows for separate voltage binning of each of the parts. AMD’s Secure Processor, with cryptography acceleration, secure boot and BitLocker support are all in the mix.

AMD Launches Carrizo: The Laptop Leap of Efficiency Efficiency and Die Area Savings
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  • albert89 - Monday, June 8, 2015 - link

    Tell me where you can buy one for that price. Because most I see are like this article described, double the price.
  • Prashant Jain - Wednesday, June 3, 2015 - link

    Switchable Graphics is a real deal in Windows ecosystem, Linux lacks a ton of drivers and not expected to deliver more therefore AMD has scope in enterprise servers where Linux is thriving therefore AMD will succeed in long run if they somehow manage to have at par CPUs with Intel.
  • Penti - Wednesday, June 3, 2015 - link

    Switchable graphics from AMD with Intel CPU's is just so much worse than Optimus.
  • Wolfpup - Wednesday, June 3, 2015 - link

    And Optimus already doesn't work. I'm NEVER buying another PC with it, and am just thankful mine lets you disable it and run on the Nvidia GPU directly.
  • duploxxx - Thursday, June 4, 2015 - link

    well nice to hear that switchable amd graphics sucks, so does optimus. setting manual profiles is ok with optimus, i supose the same with AMD, anything automatic is NOT.

    oh and every time i dock - undock my explorer, chrome, firefox will crash due to graphics issues... uber optimus.
  • barleyguy - Wednesday, June 3, 2015 - link

    Switchable graphics sucks, bad. My current work laptop is Intel/ATI, and I've also used Intel/NVidia. Neither one works as well as just a single video adapter. I've had issues with windows not refreshing, driver crashes, and just overall wonkiness.

    Luckily Dell lets you disable it completely in the BIOS. That tends to get rid of the issues.
  • RandUser - Thursday, June 4, 2015 - link

    It depends. On my ASUS laptop Optimus works perfectly, no isues.
  • Margalus - Wednesday, June 3, 2015 - link

    1366x768 is perfectly fine on 15.6 inch devices...
  • fokka - Wednesday, June 3, 2015 - link

    if you're bordering on blind, yes.
  • meacupla - Wednesday, June 3, 2015 - link

    Actually, the blind and hard of seeing, benefit greatly from higher DPI with much sharper images.

    I wouldn't be surprised if 1366x768 caused blindness in the first place, however.

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