What is WDDM 1.3 in Win 8.1 Preview and why should I care?


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Message boards : Number crunching : What is WDDM 1.3 in Win 8.1 Preview and why should I care?

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TBar
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Message 1386479 - Posted: 1 Jul 2013, 16:12:46 UTC

I was looking around, trying to decide what would be best for this new AMD card that doesn't work in XP, and I ran across this,
Feature Highlights of the AMD Catalyst™ Windows® 8.1 Preview Driver: WDDM 1.3 driver model support for the following products...
There aren't many cards supported, so, you would think there was something special about it. Or maybe, it's just a lousy Preview driver...
I do have 'the card' in Windows '8.0' at present. I'm just wondering if I should try out the 8.1 Preview with the 'limited' driver support.
Decisions, decisions...

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Message 1386494 - Posted: 1 Jul 2013, 16:23:54 UTC - in response to Message 1386479.

These are the features in the new WDDM 1.3 standard:

http://msdn.microsoft.com/en-us/library/windows/hardware/dn265512(v=vs.85).aspx


  • Enumerating GPU engine capabilities
    An interface that's used to query a GPU node's engine capabilities.
  • Using cross-adapter resources in a hybrid system
    Describes how to handle resources that are shared between integrated and discrete GPUs.
  • YUV format ranges in Windows 8.1 Preview
    An interface that's used to signal user-mode display drivers that video inputs are either in the studio luminance range or in the extended range.
  • Wireless displays (Miracast)
    Describes how to enable wireless (Miracast) displays.
  • Multiplane overlay support
    Describes how to implement multiplane overlays.

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Message 1386497 - Posted: 1 Jul 2013, 16:33:42 UTC - in response to Message 1386494.

So, will this supercharge SETI, or kill it stone cold dead? If you install a 7750 in XP with an older OpenCL supported card, reinstall OpenCL for the older card, every time an App queries OpenCL support, XP instantly reboots. Not even enough time for a BSOD...reboot. I'm just wondering what would happen with this driver and BOINC...

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Message 1386499 - Posted: 1 Jul 2013, 16:47:29 UTC - in response to Message 1386497.
Last modified: 1 Jul 2013, 16:50:07 UTC

WDDM specifies features a driver should support. This should be completely separate from OpenCL which is a different standard.

[Edited to add] If you want to make sure you still have OpenCL functionality, you may want to see if AMD has released a fully WDDM 1.3 / OpenCL complaint preview driver for Windows 8.1.

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Message 1386512 - Posted: 1 Jul 2013, 17:06:43 UTC - in response to Message 1386499.

It says it supports OpenCL;

Support for AMD Features, including:
AMD Eyefinity
OpenCL
OpenGL
UVD
AMD Dual Graphics/AMD CrossFire™ Technology
AMD Overdrive™
AMD Catalyst Control Center/Vision Engine Control Center

Maybe I'll give it a try in a few days once I recover from my bouts with the 7750 in Linux and OSX on a Mac. Hopefully, someone else would have tried the 8.1 driver by then :-)

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Message 1386644 - Posted: 1 Jul 2013, 23:30:35 UTC

The biggest remaining issue with ATi OpenCL drivers - CPU availability required.
Even with quite low CPU usage CPU core should be freed to load GPU fully.
Cause we see such behavior not under all drivers (for same app) this could change in future driver revisions.
So, worth to try and see how app behaves under new driver and fully loaded CPU.

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Message 1386797 - Posted: 2 Jul 2013, 12:25:26 UTC

I just ran a bench on win 8.1 preview using 13.4 drivers.
Works fine w/o problems.

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Message 1386801 - Posted: 2 Jul 2013, 13:16:20 UTC - in response to Message 1386797.

I just ran a bench on win 8.1 preview using 13.4 drivers.
Works fine w/o problems.

and CPU usage?
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Message 1386889 - Posted: 2 Jul 2013, 21:22:02 UTC - in response to Message 1386801.

I just ran a bench on win 8.1 preview using 13.4 drivers.
Works fine w/o problems.

and CPU usage?


I posted the complete bench at Lunatics.

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Message boards : Number crunching : What is WDDM 1.3 in Win 8.1 Preview and why should I care?

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