If your card manufacturer has Dx9 drivers available then download Dx9. You don''t need to use functions that are not available on your card. If you are uncertain as to which you can use you can check the "Caps" for your card. Since you are beginning to learn DX it is better to start with the latest version available, as it will be old by the time you finish. Dx9 will also be around for a couple of years as MS has declared that they will not make a new major version for quite some time.

Good luck on your programming.

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I could be wrong or right but the ideas are mine.