I have both and I kinda like them both hehe, if you're looking for onboard LAN/Sound/Raid then you won't go wrong with 8IRXP.. Also you don't need to mod your CPU for any extra vcore voltage, in another word, it can go up to 1.85v by default

.. P4B266-c is what I'm using right now, but nothing onboard.. Both will give you the same performance, but 8IRXP has more options
