Getting the Best out of an Ivy Bridge HTPC: Windows 8, madVR and More..
by Ganesh T S on January 20, 2013 3:00 PM EST- Posted in
- Home Theater
- Intel
- HTPC
- Ivy Bridge
- Windows 8
- Passive Cooling
HTPC Decoding and Rendering Benchmarks: madVR
In the preceding section, we looked at EVR and EVR-CP. Videophiles often prefer madVR as their renderer because of the choice of scaling algorithms available as well as myriad other features. In our original Ivy Bridge HTPC review, I had been very satisfied with HD 4000 and madVR except for a few corner cases involving high frame rate material which also required both luma and chroma scaling (such as 720p60 material). One of the issues in our initial testbed was that we were using DDR3-1333 DRAM. Our current system under consideration uses DDR3-1600. This is more than enough to get madVR working with default scaling algorithm settings for all video material 1080p60 or lesser. Readers interested in seeing madVR in action on the HD 4000 should definitely check out Andrew's excellent piece in Missing Remote comparing HD 2500 and HD 4000 for madVR.
It is not possible to use native DXVA2 decoding with madVR because the decoded frames are not made available to an external renderer directly. To work around this issue, LAV Video Decoder offers three options. The first option involves using software decoding.
| LAV Video Decoder (Software Fallback) + madVR | ||
| Stream | GPU Usage % | Power Consumption |
| 480i60 MPEG-2 | 70.84 | 48.19 |
| 576i50 H.264 | 72.8 | 50.41 |
| 720p60 H.264 | 75.88 | 58.23 |
| 1080i60 H.264 | 61.51 | 59.05 |
| 1080i60 MPEG-2 | 61.22 | 55.09 |
| 1080i60 VC-1 | 62.22 | 59.85 |
| 1080p60 H.264 | 73.65 | 60.91 |
The second option is to use either QuickSync or DXVA2 Copy-Back. In either case, the decoded frames are brought back to the system memory for madVR to take over. The power consumption profile improves quite a bit, particularly for the 720p60 and 1080p60 streams.
| LAV Video Decoder (QuickSync) + madVR | ||
| Stream | GPU Usage % | Power Consumption |
| 480i60 MPEG-2 | 71.37 | 47.72 |
| 576i50 H.264 | 71.28 | 49.83 |
| 720p60 H.264 | 75.76 | 54.92 |
| 1080i60 H.264 | 62.5 | 56.15 |
| 1080i60 MPEG-2 | 62.02 | 55.81 |
| 1080i60 VC-1 | 61.86 | 55.94 |
| 1080p60 H.264 | 66.31 | 56.58 |
One of the interesting features to be integrated into the recent madVR releases is the option to perform DXVA scaling. This is particularly interesting for HTPCs running Intel GPUs because the Intel HD Graphics engine uses dedicated hardware to implement support for the DXVA scaling API calls. AMD and NVIDIA apparently implement those calls using pixel shaders. In order to obtain a frame of reference, we repeated our benchmark process using DXVA2 scaling for both luma and chroma instead of the default settings.
| LAV Video Decoder (QuickSync) + madVR (DXVA Scaling) | ||
| Stream | GPU Usage % | Power Consumption |
| 480i60 MPEG-2 | 50.33 | 43.54 |
| 576i50 H.264 | 52.39 | 44.33 |
| 720p60 H.264 | 57.34 | 48.82 |
| 1080i60 H.264 | 62.63 | 55.52 |
| 1080i60 MPEG-2 | 62.34 | 55.21 |
| 1080i60 VC-1 | 62.06 | 55.51 |
| 1080p60 H.264 | 65.56 | 55.33 |
DXVA scaling results in much lower GPU usage for SD material in particular with a corresponding decrease in average power consumption too. Users with Intel GPUs can continue to enjoy other madVR features while giving up on the choice of a wide variety of scaling algorithms.
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ganeshts - Tuesday, January 22, 2013 - link
I wish :) But, to be honest, MS doesn't even provide keys to us (We have to use the eval period, unactivated)That said, I first set up Win 8 for a relative on a newly purchased notebook, and I seriously hated it. Even now, I am not used to the various new features available to interact with the OS. But, I have now come to realize that, technically, the OS has some very interesting improvements in terms of efficiency and multimedia support (at least). Give the eval version a try without activating, you might be pleasantly surprised :)
glugglug - Wednesday, January 23, 2013 - link
Replacing multiple DVRs is the primary use of my PC..I suppose you could have a Media Center w/CableCARD build separate from the HTPC you have here, but IMO, Media Center is **the** killer HTPC app.
NikosD - Friday, January 25, 2013 - link
4K decoding ? Why not benchmark at that resolution ?Ivy and VP5 are the only GPUs (VPUs) capable of HW accelerated H.264 4K decoding.
CSMR - Sunday, January 27, 2013 - link
Power consumption of around 40W is high for doing something as simple as media playback.With an Ivy Bridge chip you should be able to get sub 20W easily, and in fact sub 10W is achievable (http://www.silentpcreview.com/forums/viewtopic.php...
For a fanless system, this is important and will improve reliability and difficulty of cooling.
mr0000000000 - Wednesday, January 30, 2013 - link
Lordy that thing is beautiful - is that just a rendering or does that actually exist?PokerGuy - Monday, February 4, 2013 - link
From the article: "I would strongly suggest HTPC users relying on WMC (irrespective of the OS) to move on to other platforms."What other platform could I move to that would allow me to use cablecard? I have HD Homerun Prime and absolutely love it. I can watch any and everything on any PC in the house, including my HTPC for my main tv in the living room. I use XBMC as my library manager for all my movies and music, but I can't use it with cablecard, so I still need WMC for that purpose.
Win 8 comes without WMC, unless you want to pay extra, so for me it's a step backwards from Win 7. Paying to downgrade in functionality doesn't seem like a good idea.
connor2k - Friday, February 15, 2013 - link
I have looked through most of the comments. Is it listed elsewhere?Deuge - Wednesday, September 18, 2013 - link
Hi Ganesh, i notice the new haswell NUC with HD5000 is coming out. Will you be doing an HTPC review of it?? Seems like the perfect HTPC to me.http://www.legitreviews.com/intel-nuc-kit-d54250wy...