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<blockquote data-quote="mPod" data-source="post: 12255" data-attributes="member: 11199"><p>A DX9 card can do all the DX9 operations directly by its hardware. If it is just a DX8 card, and the driver is DX9 compatible, all these funtions will be performed by the software driver, which results in higher CPU usage. Media Portal is a DirectX 9 application and is heavily using DX9 stuff. That's not only 3D, you can do a search on Microsoft to get details.</p><p>Main purpose of DX9 in MP is the use of VMR9 to display video and graphics on top, for example. You can see the difference if you'd use overlay and the OSD with some shading, grading, etc. All other graphics stuff also takes advantage of DX9 hardware acceleration to lower CPU usage. It's not a must, but can be useful in HTPCs with lower CPUs to reduce heating etc.</p><p>These are the main reasons, AFAIK.</p></blockquote><p></p>
[QUOTE="mPod, post: 12255, member: 11199"] A DX9 card can do all the DX9 operations directly by its hardware. If it is just a DX8 card, and the driver is DX9 compatible, all these funtions will be performed by the software driver, which results in higher CPU usage. Media Portal is a DirectX 9 application and is heavily using DX9 stuff. That's not only 3D, you can do a search on Microsoft to get details. Main purpose of DX9 in MP is the use of VMR9 to display video and graphics on top, for example. You can see the difference if you'd use overlay and the OSD with some shading, grading, etc. All other graphics stuff also takes advantage of DX9 hardware acceleration to lower CPU usage. It's not a must, but can be useful in HTPCs with lower CPUs to reduce heating etc. These are the main reasons, AFAIK. [/QUOTE]
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