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Is GPU memory virtualization completely optional in DX10?

EastCoasthandle

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I am not sure if this is true or not but if it is, does this partly explain the poor DX10 performance from the R600?
"WDDM now allows for "virtualized" video memory. Virtualization abstracts video memory so that it is no longer necessary to think about creating a resource in either video or system memory. Just specify what the resource is going to be used for and the system will place the memory in the best place possible. Additionally, virtualization allows for the allocation of more memory than actually exists on the hardware. Memory is then paged into the correct hardware as needed.
source

Due to the memory virtualization features of WDDM, we do not have a VRAM requirement for WDDM drivers...WDDM: The Windows Vista Display Driver Model. [Microsoft.com]: WDDM is a significant evolution of the graphics driver infrastructure and will not be backwards compatible with XPDM drivers.

The WDDM video driver model is only available on Vista machines; XPDM video driver model is available for both Vista, XP, and Server 2003 machines...
The DirectX team and the video card manufacturers have worked hard to bring the WDDM model to fruition, which brings a more reliable and stable graphics environment. For example:

- WDDM virtualizes their video memory: with this feature, your Avalon app is less likely to run out of video memory and fallback to software.

- A larger portion of the WDDM driver code is run in user mode rather than kernel mode (as opposed to XPDM); if the driver crashes in the kernel, the machine blue screens.
source
 
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so wait... the 2900 should actually kick ass but now cant coz of the way vista is?

or did i read that wrong.. i only quickly skimmed coz im eating pizza :)
 

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Theres nothing mentioned there becaue of speed, its just saying that D3D10 is capable of running on windows XP.

Note that i dont mean DX10 in its entirety, just the Direct3D component.
It seems the big reason for holding back was ditched due to pressure from Nvidia/other companies.
 

EastCoasthandle

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so wait... the 2900 should actually kick ass but now cant coz of the way vista is?

or did i read that wrong.. i only quickly skimmed coz im eating pizza :)
I honestly don't know. I created this thread in hopes of someone would post a definitive answer. IMHO opengl should be the way to go but what dev's are creating new games using it? :confused:
 
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Yes, now it's completely optional, nVidia was having a hard time implementing it, and MS dropped it from the list of required features in the DX10 spec.

There's speculation that this may help port DX10 to XP, but so far no word from MS, and to be honest, I don't think they'll do something that would make ppl lees likely to migrate to Vista... Only time will tell :)
 

EastCoasthandle

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Did you guys see the abysmal R600 results of WiC using DX10.
I wonder how that game is coded for DX10? R600 seems to be doing pretty well in other games so there's something a miss here.
 
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