The Comparison Points

Intel sort of dropped this CRB off without anything to compare it to, so I scrambled over the past week looking for things to put Iris Pro’s performance in perspective. The obvious candidate was Apple’s 15-inch MacBook Pro with Retina Display. I expect its successor will use Iris Pro 5200, making this a perfect comparison point. The 15-inch rMBP is equipped with a GeForce GT 650M with a 900MHz core clock and a 5GHz memory datarate.

I also dusted off a GeForce GT 640 desktop card to shed a little more light on the 650M comparison. The 640 has a slightly higher core clock (925MHz) but it only has 1.7GHz DDR3, working out to be 27GB/s of memory bandwidth compared to 83GB/s for the 650M. Seeing how Iris Pro compares to the GT 640 and 650M will tell us just how good of a job Crystalwell is doing.

Next up is the desktop Core i7-4770K with HD 4600 graphics. This is a Haswell GT2 implementation, but at a much higher TDP than the 47W mobile part we’re comparing it to (84W). In a notebook you can expect a much bigger gap in performance between the HD 4600 and Iris Pro than what we’re showing here. Similarly I also included a 77W HD 4000 for a comparison to Ivy Bridge graphics.

On the AMD front I have the 35W A10-4600M (codename Trinity), featuring AMD’s 7660G processor graphics. I also included the 100W A10-5800 as a reference point since we were largely pleased with the GPU performance of Trinity on the desktop.

I listed TDPs with all of the parts I’m comparing here. In the case of the GT 640 I’m adding the TDP of the CPU (84W) and the GPU (65W). TDP is half of the story with Iris Pro, because the CPU, GPU and eDRAM all fit into the same 47W power envelope. With a discrete GPU, like the 650M, you end up with an extra 45W on top of the CPU’s TDP. In reality the host CPU won’t be running at anywhere near its 45W max in that case, so the power savings are likely not as great as you’d expect but they’ll still be present.

At the request of at least one very eager OEM, Intel is offering a higher-TDP configuration of the i7-4950HQ. Using Intel’s Extreme Tuning Utility (XTU) I was able to simulate this cTDP up configuration by increasing the sustained power limit to 55W, and moving the short term turbo power limit up to 69W. OEMs moving from a 2-chip CPU + GPU solution down to a single Iris Pro are encouraged to do the same as their existing thermal solutions should be more than adequate to cool a 55W part. I strongly suspect this is the configuration we’ll see in the next-generation 15-inch MacBook Pro with Retina Display.

To remove as many bottlenecks as possible I configured all integrated GPU options (other than Iris Pro 5200) with the fastest supported memory. That worked out to being DDR3-2133 on desktop Trinity and desktop IVB, and DDR3-2400 on desktop Haswell (HD 4600). The mobile platforms, including Iris Pro 5200, all used DDR3-1600.

On the software side I used NVIDIA's GeForce R320 v320.18, AMD's Catalyst 13.6 beta and Intel's 9.18.10.3177 drivers with Crystalwell support.

The Core i7-4950HQ Mobile CRB Metro: Last Light
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  • jasonelmore - Sunday, June 2, 2013 - link

    Looking at the prices, this will raise the price or Lower the margins of the 13" Retina Macbook Pro by about $150 each. Reply
  • mschira - Sunday, June 2, 2013 - link

    Yea laptops benefit most - good for them.
    But what about the workstation?
    So intel stopped being a CPU company and turned into a mediocre GPU company? (can even beat last years GT650M)
    I would applaude the rise in GPU performance if they had not completely forgotten the CPU.
    M.
    Reply
  • n13L5 - Monday, June 3, 2013 - link

    You're exactly right.

    13" ultrabook buyers who need it the most get little to nothing out of this.

    And desktop users don't need or want GT3e and it uses system RAM. Better off buying a graphics card instead of upgrading to Haswell on desktops.
    Reply
  • glugglug - Tuesday, June 4, 2013 - link

    While I agree this misses "where it would benefit most", I disagree on just *where* that is.

    I guess Intel agrees with Microsofts implicit decision that media center is dead. Real-time HQ quicksync would be perfect to transcode anything extenders couldn't handle, and would also make the scanning for and skipping of commercials incredibly efficient.
    Reply
  • n13L5 - Tuesday, June 11, 2013 - link

    Core i5…4350U…Iris 5000…15W…1.5 GHz
    Core i7…4550U…Iris 5000…15W…1.5 GHz
    Core i7…4650U…Iris 5000…15W…1.7 GHz

    These should work. The 4650U is available in the Sony Duo 13 as we speak, though at a hefty price tag of $1,969
    Reply
  • Eric S - Monday, July 1, 2013 - link

    The last 13" looks like they were prepping it for a fusion drive then changed their mind leaving extra space in the enclosure. I think it is due for an internal redesign that could allow for a higher wattage processor.

    I think the big deal is the OpenCL performance paired with ECC memory for the GPU. The Nvidia discrete processor uses non-ECC GDDR. This will be a big deal for users of Adobe products. Among other things, this solves the issue of using the Adobe mercury engine with non-ECC memory and the resulting single byte errors in the output. The errors are not a big deal for games, but may not be ideal for rendering professional output and scientific applications. This is basically a mobile AMD FireGL or Nvidia Quadro card. Now we just need OpenCL support for the currently CUDA-based mercury engines in After Effects and Premiere. I have a feeling that is coming or Adobe will also lose Mercury Engine compatibility with the new Mac Pro.
    Reply
  • tviceman - Saturday, June 1, 2013 - link

    Impressive iGPU performance, but I knew Intel was absolutely full of sh!t when claiming equal to or better than GT 650m performance. Not really even close, typically behind by 30-50% across the board. Reply
  • Krysto - Saturday, June 1, 2013 - link

    When isn't Intel full of shit? Always take what the improvements they claim and cut it in half, and you'll be a lot closer to reality. Reply
  • xtc-604 - Saturday, June 8, 2013 - link

    Lol...you think that's bad? Look at Apple's claims. "over 200 new improvements in Mountain Lion" Reply
  • piroroadkill - Saturday, June 1, 2013 - link

    sh<exclamation point>t? What are we? 9? Reply

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