Dell :: Current DX10 Hardware Already Obsolete

Existing DX10 hardware - such as the GeForce 8800 or the Radeon 2900 - won't work with the new DX10.1 The 0.1 revision requires new hardware for support.
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Form MS August 2007 DirectX SDK:
Direct3D 10.1 Tech Preview
Direct3D 10.1 is an incremental, side-by-side update to Direct3D 10.0 that provides a series of new rendering features that will be available in an upcoming generation of graphics hardware.

* TextureCube Arrays which are dynamically indexable in shader code.

* An updated shader model (shader model 4.1).

* The ability to select the MSAA sample pattern for a resource from a palette of patterns, and retrieve the corresponding sample positions.

* The ability to render to block-compressed textures.

* More flexibility with respect to copying of resources.

* Support for blending on all unorm and snorm formats.

This tech preview provides an early look at these features and the handful of new APIs that support them. The August 2007 Direct3D 10.1 Tech Preview requires the Windows Vista SP1 Beta which will be available to MSDN subscribers once it is publicly released.