I use xp64 / 340.52 drivers instead xp32 to try. Mybe it's better for sm3.0 subtest. I not use lod 15x as you saw. If you check cpu score for example TeamAU, it's higher, for only 50mhz difference. I rebench with video OK.
For 2001 i know xp64/340.52 it's wrong, but i need install xp32. For sure the result mybe better. I should try.