Quick Sync Image Quality & Performance

Intel obviously focused on increasing GPU performance with Ivy Bridge, but a side effect of that increased GPU performance is more compute available for Quick Sync. As you may recall, Sandy Bridge's secret weapon was an on-die hardware video transcode engine (Quick Sync), designed to keep Intel's CPUs competitive when faced with the onslaught of GPU computing applications. At the time, video transcode seemed to be the most likely candidate for significant GPU acceleration so the move made sense. Plus it doesn't hurt that video transcoding is an extremely popular activity to do with one's PC these days.

The power of Quick Sync was how it leveraged fixed function decode (and some encode) hardware with the on-die GPU's EU array. The combination of the two resulted in some pretty incredible performance gains not only over traditional software based transcoding, but also over the fastest GPU based solutions as well.

Intel put to rest any concerns about image quality when Quick Sync launched, and thankfully the situation hasn't changed today with Ivy Bridge. In fact, you get a bit more flexibility than you had a year ago.

Intel's latest drivers now allow for a selectable tradeoff between image quality and performance when transcoding using Quick Sync. The option is exposed in Media Espresso and ultimately corresponds to an increase in average bitrate. To test image quality and performance, I took the last Harry Potter Blu-ray, stripped it of its DRM and used Media Espresso to make it playable on an iPad 2 (1024 x 768 preset).

In the case of our Harry Potter transcode, selecting the Better Quality option increased average bitrate from to 3.86Mbps to 5.83Mbps. The resulting file size for the entire movie increased from 3.78GB to 5.71GB. Both options produced a good quality transcode, picking one over the other really depends on how much time (and space) you have as well as the screen size of the device you'll be watching it on. For most phone/tablet use I'd say the faster performing option is ideal.

Intel Core i7 3770K (x86) Intel Quick Sync (SNB) Intel Quick Sync (IVB) Intel Quick Sync, Better (IVB) NVIDIA GeForce GTX 680 AMD Radeon HD 7970
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While AMD has yet to enable VCE in any publicly available software, NVIDIA's hardware encoder built into Kepler is alive and well. Cyberlink Media Espresso 6.5 will take advantage of the 680's NVENC engine which is why we standardized on it here for these tests. Once again, Quick Sync's transcoding abilities are limited to applications like Media Espresso or ArcSoft's Media Converter—there's still no support in open source applications like Handbrake.

Compared to the output from Quick Sync, NVENC appears to produce a softer image. However, if you compare the NVENC output to what we got from the software/x86 path you'll see that the two are quite similar. It seems that Quick Sync, at least in this case, is sharpening/adding more noise beyond what you'd normally expect. I'm not sure I'd call it bad, but I need to do some more testing before I know whether or not it's a good thing.

The good news is that NVENC doesn't pose any of the horrible image quality issues that NVIDIA's CUDA transcoding path gave us last year. For getting videos onto your phone, tablet or game console I'd say the output of either of these options, NVENC or Quick Sync, is good enough.

Unfortunately AMD's solution hasn't improved. The washed out images we saw last year, particularly in dark scenes prior to a significant change in brightness are back again. While NVENC delivers acceptable image quality, AMD does not.

The performance story is unfortunately not much different from last year either. The chart below is average frame rate over the entire encode process.

CyberLink Media Espresso 6.5—Harry Potter 8 Transcode

Just as we saw with Sandy Bridge, Quick Sync continues to be an incredible way to get video content onto devices other than your PC. One thing I wanted to make sure of was that Media Espresso wasn't somehow holding x86 performance back to make the GPU accelerated transcodes seem much better than they actually are. I asked our resident video expert, Ganesh, to clone Media Espresso's settings in a Handbrake profile. We took the profile and performed the same transcode, the result is listed above as the Core i7 3770K (Handbrake). You will notice that the Handbrake x86/x264 path is definitely faster than Cyberlink's software path, by over 50% to be exact. However even using Handbrake as a reference, Quick Sync transcodes over 2x faster.

In the tests below I took the same source and varied the output quality with some custom profiles. I targeted 1080p, 720p and 480p at decreasing average bitrates to illustrate the relationship between compression demands and performance:

CyberLink Media Espresso 6.5—Harry Potter 8 Transcode

CyberLink Media Espresso 6.5—Harry Potter 8 Transcode

CyberLink Media Espresso 6.5—Harry Potter 8 Transcode

Unfortunately NVENC performance does not scale like Quick Sync. When asked to preserve a good amount of data, both NVENC and Quick Sync perform similarly in our 1080p/13Mbps test. However ask for more aggressive compression ratios for lower resolution/bitrate targets, and the Intel solution quickly distances itself from NVIDIA. One theory is that NVIDIA's entropy encode block could be the limiting factor here.

Ivy Bridge's improved Quick Sync appears to be aided both by an improved decoder and the HD 4000's faster/larger EU array. The graph below helps illustrate:

If we rely on software decoding but use Intel's hardware encode engine, Ivy Bridge is 18% faster than Sandy Bridge in this test (1080p 13Mbps output from BD source, same as above). If we turn on both hardware decode and encode, the advantage grows to 29%. More than half of the performance advantage in this case is due to the faster decode engine on Ivy Bridge.

Power Consumption Final Words
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  • jmcb - Saturday, May 12, 2012 - link

    I was thinking the exact same thing.

    I waited long to jump on the dual core bandwagon, 2008 with a C2D 8400. I havent jumped on the quad core wagon yet. Was waiting for them to run cooler.

    This seems like a good time to make the jump.
    Reply
  • CeriseCogburn - Friday, June 01, 2012 - link

    I'm going to get rid of my 2500K @ 4.8GHz , because it's HD3000 just isn't doing it for BF3,

    and I'm going Trinity man !

    See me and my amd apu on the gaming servers !

    a. totally wanna be cool amd fan
    b. fantasy boy with lunch money from mommie in pocket
    c. bonkers
    d. all the above
    Reply
  • p05esto - Monday, April 23, 2012 - link

    Yea, but WHEN can I buy one? Forgive me if I missed that all important detail. My desktop is 2.5 yrs old and am ready to upgrade here. Show me where to buy, lol. Reply
  • Catalina588 - Monday, April 23, 2012 - link

    OEM boxes arrive April 29th. I expect NewEgg will have parts shortly thereafter. Reply
  • tiki037 - Wednesday, April 25, 2012 - link

    +1

    I thought the April 23 launch date meant that was when we would be able to buy one.
    Reply
  • Tommyv2 - Monday, April 23, 2012 - link

    Why no benchmarks against a 2700K, you know - a real platform comparison? I'm guessing it's exactly the same performance? Reply
  • Anand Lal Shimpi - Monday, April 23, 2012 - link

    Working on testing the 2700K now - didn't have one at the time that the CPU tests were conducted, the difference is small as you can guess, will add results to bench as they are completed.

    Take care,
    Anand
    Reply
  • Ratman6161 - Monday, April 23, 2012 - link

    ...but really, they already have large quantities of benchmarks of the 2600K and the difference between that and 2700K is going to be relatively meaningless...my guess, not worth the trouble of running the whole suite of benchmarks on it. To my knowledge, the only difference is 100 MHz of clock speed, right? Reply
  • deadsix - Monday, April 23, 2012 - link

    Any chance Anand that we get a 35W Quad Core processor for laptops like the Macbook Pro 13" Reply
  • Kristian Vättö - Monday, April 23, 2012 - link

    There is i7-3612QM which is a 35W 2.1GHz quad core. Whether Apple uses it is another question, though.

    http://www.anandtech.com/show/5772/mobile-ivy-brid...
    Reply

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