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 - Tuesday, June 23, 2015 - link

    Most people are doing fine with an Intel atom, Celeron or Pentium with a dedicated GPU while most AMD APU's are over twice the horse power of the above and that's without a dedicated GPU ! Seriously........the 1366x768 issue was fixed a long time ago while Intel are still charging dinosaur CPU's at twice the price !
  • Stuka87 - Tuesday, June 2, 2015 - link

    Great article. Carrizo really looks promising. Looking forward to performance and power consumption numbers when the time comes.
  • Refuge - Wednesday, June 3, 2015 - link

    I'm trying not to get my hopes up too high, AMD has a history of over-promising, and under-delivering.

    But my 3rd gen APU is long in the teeth and I could use a new work laptop. If it is everything they say it will be, I expect to pickup a new Carrizo laptop this year, if I can find them that is.
  • monstercameron - Tuesday, June 2, 2015 - link

    I believe the improvements to power use for video decode is called intra-frame power-gating, which makes sense seeing how the uvd engine can decode a video stream x times faster than realtime.
  • fteoath64 - Wednesday, June 3, 2015 - link

    This chip would be perfect for a HTPC serving 4K and below streams. Gives the Shield TV box a run for its money!. Go AMD.
  • jjj - Tuesday, June 2, 2015 - link

    lol another launch without reviews and they wonder why we'll all forget about their product by next week. Good or bad ,we would at least know what it is.
  • SolMiester - Wednesday, June 3, 2015 - link

    I agree...too many promises from this outfit, not enough action.
  • FlushedBubblyJock - Tuesday, June 9, 2015 - link

    everything is a secret, like bad governments
  • bloodypulp - Wednesday, June 3, 2015 - link

    Likely aligning reviews with Windows 10 launch. Soon.
  • JDG1980 - Tuesday, June 2, 2015 - link

    Carrizo looks promising, though I want to see actual benchmarks.

    AMD needs to bring the HEVC decoder to their discrete video cards (not just Fiji).

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