"Lee Marsh" avait prétendu :
"Juan Alvarez" a pensé très fort :

why is the Radeon 9800 Pro missing and why are the results totally
different from other tests, that 'seem' to be better done ?

I have no idea why the 9800 Pro is missing perhaps they don't have one?
as for why the results are different to other reviews, maybe Guru3D are
just more advanced at tweaking graphics cards and computers :P