My 820A324 is certainly smooth on water with this P5K Prem, I have not tested Orthos with this chip yet as its still in the Torture rack but my CO 8400 needed 1.45v just to hold 4500 solid. I am waiting for my other P5Q Deluxe back in for a swap but even this board will do 545fsb which is decent. Max so far is 5200mhz at 1.7v. My girlfriend just got me a Rampage II Extreme for Christmas so I guess a I7 system is in the works pretty soon.