Beirut, nope, DX10 is supposed to be a whole new beast, a radical departure. No more pixel and vertex shaders -- all cards will have to support a unified shader model. Also, for whatever reason, the story is that graphics hardware can't have its own private dialogue in DX10, so no more SLI or Crossfire.
There are even rumors that high-end DX10 GPUs will require their own power supplies, and that some will come water-cooled out of the gate.
In the absence of knowledge, the rumors are running rampant.
I want to thank everyone for encouraging me to spend money on new parts. You're gonna make me cry ...
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Tears of joy, just to be clear.
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Here's some old but confirmed info about DX10. Scary stuff ...
DirectX 10...and so it ends!
Backward compatibly with DirectX 9,8,7 isn't really necessary
There are troubled times ahead. Through one bold move, Microsoft has decided that it will not support, the already too “old” DirectX 9, not to mention DirectX 8 or any of the previous versions. But... it appears to be some logic hidden somewhere.
The new DirectX will not be named Windows Graphic Foundation (WGF) as it was planned and will remain at the old name, as in DirectX 10. It will be released with their brand new operating system Vista. This news API will be composed of new and faster dynamic link libraries (DLLs) and will run much faster (so they say).
Microsoft has decided that backward compatibly with DirectX 9,8,7 isn't really necessary as there will probably will be even less compatible with Vista.
Even so, dear Microsoft hasn't totally forgotten us. Some sort of “compatibility” will be available through a software layer (probably some emulation) which will have its price in system resources, as it will run much slower. The good news is that DirectX 10 will relieve some of the burden on the CPU.
And of course it will have support for the next generation of Pixel Shaders 4.0, although it will probably surface before even Vista's release due to the rapid development of graphic cards.
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