"Force Anisotropic filtering in Direct3D"
Works only with 9008 XP/6006(or newer) drivers, increasing value of "AnisoDegree" will increase quality, but decrease speed
"BlockWrite"
Enable BlockWrite for videomemory, greatly increasing FillRate. Works only with SGRAM or DDR SGRAM videomemory.
"DrvStretchBLT"
Hardware accseleration of bit-block transferring with stretching.
"UCWC"
Enabling UnCachedWriteCombining caching mode for linear framebuffer. Increasing videomemory speed while writing trough linear framebuffer, especially on PCI videocards.
"Enable LCD controller"
Enabling LCD controller (may be disabled in some drivers).
"Enable DDC2"
Enabling querying of monitor in DDC2 mode. Try to disable, if yours monitior don't decetcting correctly.
"Enable DMA copy."
Enabling copying in videomemory in DMA mode. Decreasing CPU usage.