Just to clarify, I said 16x anisotropic filtering. If you are asking what'll happen with 16xCSAA + 8xSGSSAA, it should be the same as 8xMSAA. There is a specific sample SGSAA uses that CSAA doesn't modify. 8xSGSSAA will murder performance.
Edt: if your question was about LOD at 8xSGSSAA, you can set it as low as -1.5 without seeing issues. That will further hurt performance though.
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