Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
Ps. Why are you selling your 4890 CF? Don't they blow away every single modern game?
Dx11 is backwards compatible with Dx10, Dx10 graphics cards should run Dx11 just fine.
In my humble opinion, wait for the Dx11 games to come out and if they drop your fps below ~55, upgrade.
Wikipedia said:The Direct3D 11 runtime will be able to run on Direct3D 9 and 10.x-class hardware and drivers, using the D3D10_FEATURE_LEVEL1 functionality first introduced in Direct3D 10.1 runtime.
Dx11 is backwards compatible with Dx10, Dx10 graphics cards should run Dx11 just fine.
In my humble opinion, wait for the Dx11 games to come out and if they drop your fps below ~55, upgrade.
A dx10 card will not run dx 11 unless it supports dx11 out of the box