Thanks to Homer Simpson and RadeonMAXX. Some of these settings will only have an effect in future games.
REGEDIT4
[HKEY_LOCAL_MACHINE\Software\ATI Technologies\Driver\0000\atidxhal]
"DisableHierarchicalZ"="0"
"EnableWaitUntilIdxTriList2"="1"
"Vsync"="1"
"AntiAlias"="0"
"ZFormats"="15"
"ExportCompressedTex"="1"
"DisableHyperZ"="0"
"FastZClearEnabled "="1"
"TableFogEnable"="1"
"WFogEnable"="1"
"ZFogEnable"="1"
"TCL"="1"
"TCLEnableVertexBlend2Optimize"="1"
"TCLEnableVertexBlendUseProjMat"="1"
"TCLEnableBackFaceCulling"="1"
"RasterGuardbandEnable"="1"
REGEDIT4
[HKEY_LOCAL_MACHINE\Software\ATI Technologies\Driver\0000\atidxhal]
"DisableHierarchicalZ"="0"
"EnableWaitUntilIdxTriList2"="1"
"Vsync"="1"
"AntiAlias"="0"
"ZFormats"="15"
"ExportCompressedTex"="1"
"DisableHyperZ"="0"
"FastZClearEnabled "="1"
"TableFogEnable"="1"
"WFogEnable"="1"
"ZFogEnable"="1"
"TCL"="1"
"TCLEnableVertexBlend2Optimize"="1"
"TCLEnableVertexBlendUseProjMat"="1"
"TCLEnableBackFaceCulling"="1"
"RasterGuardbandEnable"="1"