You don't downgrade dx versions, the API is built into the operating system. It does however carry support for the previous API's.
DX10 in crysis basically comes down to the Shader Model being used under ultra settings (SM4.0 instead of SM3.0), turning you settings down to high from ultra will net you more or less the same results.
The 630M just really have a whole lot of grunt to it i'm afraid.
I am starting to see that. I was however able to run Far Cry 3, Tomb Raider etc on mid-high settings. Arkham Asylum and City on very high. I don't know why Crysis is giving me problems. It runs well on dx 9 on high but with a few frame-rate drop here and there.
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