Hi. I discovered that when I use feature level 9_3 I cannot sample in pixel shader from float textures. This is totally ruined my plans about D3D11 with 10level9. What would be thereason to limit my GF7600GT which is capable to sample up to rgba128float. Maybe this is BETA limitations (I use March09 SDK)? Does anyone know detailed specifications of feature levels?

I don't believe they've changed any of the capabilities of the various feature levels since beta. I don't know if there is a publicly available description of each feature level just yet (since it is still in beta), but I believe there will be better documentation available in the August SDK (which presumably will be out sometime this month).

The purpose here isn't to limit your specific card, the purpose is to make sure that your application runs well on as many devices as possible (we took a huge caps chart and turned it into 3 groups, so you can imagine we lost quite a bit of resolution there). If you want to squeeze every last feature out of your non-dx10 card, then you'll have to use DX9.