Dolphin, the GameCube and Wii emulator - Forums

Because DX11 came later and so was less worked on, since it was implemented dx11 is improving slowly, but is still worse than dx9. In pcsx2 dx9 was never that good anyways so... ^^

(08-12-2011, 06:07 AM)Runo Wrote: [ -> ]Because DX11 came later and so was less worked on

That's not really the main reason, it's just that apparently D3D11 was better suited for PS2 emulation in pcsx2 than it is for GC/Wii emulation in Dolphin.
I don't know the internals of pcsx2 though, so I can't tell why that's so.