Render to texture is pretty basic DX stuff - with new cards, say made within two years, but Kyro for example has problems with that although it's a "new" card. To be able to do any cool post processing effects you really need render to textures... just check what difference it makes by running for example 3DMark03 gametests (no post processing) and demo (with post processing, like bloom and coloring effects).
Render to texture?
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