Interestingly enough, it does not seem to work right. If you select 'motherboards' from Products menu at page top, it gives you LGA775 mobos as first category, and as you drill down, there is no P5Q Pro under P45.
However, if you go to 'Support' section, it gives you a row of blue buttons, first one being 'Products'. Click that, gives you a table with pictures of various products, you pick motherboards - now as it lists mobo types, it firsts lists i7, and after it 775. In there, if you go 775 - P45, you get Pro on the list. Weird.