Video Post-Processing: GPU Loading

We saw in our coverage of discrete HTPC GPUs last year that noise reduction loaded up the GPU, and as such, was even disabled in the low end GPUs for want of shader resources. Starting with this review, we are planning to tabulate GPU usage under various post processing scenarios instead of running decoder benchmarks. GPU-Z gives us the necessary data for this purpose.

A 1080i60 H.264 clip (same as the one used in the discrete HTPC GPU article last year) was decoded with the LAV Video Decoder (DXVA2 Copy-Back mode) using EVR-CP as a renderer in GraphStudio Next's Decoder Performance section. Various post-processing options were turned on and off in CCC and the GPU usage recorded in each case.

Video Post Processing GPU Usage: 1080i60 H.264
AMD Radeon HD 7750 (1GB GDDR5) / Catalyst 12.1
LAV Video Decoder DXVA2 (Copy-Back) v0.46 / EVR-CP
Post Processing Algorithm GPU Load
No Video Post Processing 19%
Vector Adaptive Deinterlacing + Pulldown Detection 25%
Edge Enhancement 22%
Noise Reduction 48%
Dynamic Contrast and Colour 25%
All Post Processing / 'Enforce Smooth Video Playback' Disabled 62%

We also put some Full SBS / Full TAB 3D clips (which are basically 2 x HD resolution) through the same process. Those progressive clips resulted in around 70% of the GPU being loaded with all the post processing steps enabled.

It is not yet possible to use the madVR renderer from within GraphStudio Next, but, in future HTPC / HTPC GPU reviews, you can expect to find similar benchmarking with the madVR renderer (now that it is possible to use madVR along with hardware accelerated decode for AMD GPUs also). That said, we see that up to 62% of the GPU is loaded using just EVR-CP. It is not clear how much room is left for madVR processing, and we hope to address that question in future reviews.

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  • faizoff - Wednesday, February 15, 2012 - link

    I thought the 7770 would outperform the 6850 at least. Great review. Reply
  • sigmatau - Wednesday, February 15, 2012 - link

    For AMD cards, you look at the second number to indicate performance. An 8 series card like in the 6850 usualy performs as well or slightly better than a next generation 7 series card like the 7770.

    The 3rd number also indicates performance, but not nearly as much as the second number.
  • TerdFerguson - Wednesday, February 15, 2012 - link

    er, not really. A 58xx is faster than a 68xx. Reply
  • sigmatau - Wednesday, February 15, 2012 - link

    The 68xx series introduced an anomaly in the formula. But generaly what I stated is true. Reply
  • CeriseCogburn - Saturday, March 10, 2012 - link

    The anomaly here is the NVIDIA Gtx460 SMOKES the 7770 on everything, in every test, and costs 33% less.
    I see the crazed fan base cannot bring themselves to say it.
    I'll say it - 19 pages unsaid, over a long time.
  • Spunjji - Thursday, June 21, 2012 - link

    My word you are tiresome. Reply
  • nissangtr786 - Thursday, July 05, 2012 - link

    Using your logic a gtx 580 smoke the gtx 460.

    The reason why 7770 costs a bit is because its new technology, power consumption goes down quite a bit. Compare the card to same power consumption of new generation card maybe a 7870 and the 7870 will smoke the gtx 460.

    perferformance per watt 7770m smokes the gtx 460.
  • lambchowder - Thursday, November 01, 2012 - link

    you seriously need to stop posting. everything you post comes off as rabid nvidia fanatic, because you evidently are one, and you seem to camp outside these benchmarks to say the same thing everytime!! "this thing SMOKES~~~~!! the 7770!!! thats all i look at are the frame rates!!! i dont take anything else into consideration cause im an nvidia superfan" Reply
  • Beararam1 - Thursday, February 16, 2012 - link

    Really? I thought the 6870>5850. No? Reply
  • CeriseCogburn - Saturday, March 10, 2012 - link

    This 7k series needs some
    LOL - How low can you go amd ?
    Seems like more firings and cullings are in the works - or perhaps they already dragged the cat in and are now stuck with perverts.

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