MDK2 is an OpenGL game such as Quake 3, but once more Pentium 4 remains behind the Athlon processors.
At 1024x768x32 all processors score alike again.
Mercedes-Benz Truck Racing is tough on the 3D-card, so the differences between the processors are rather minimal even at low resolution. Still Pentium 4 makes up the rear.
At 1024x768x32 the differences become unnoticeable.