I have a T-Bird 1.4gig which I've had clocked to 1608 with the standard AMD sink/fan but although it passed the POST first time,I was less than 2 minz into UT2003 when it froze. I suspect this was possibly down to heat as the temp had risen a fair bit but not above my 'crucial' temp of 85deg. I have an XP2400 on it's way and shall begin to look into the trials & tribulations of XP2400 O/C'ers. I feel I need to upgrade my stock cooling system and have been looking at an Akasa AK899 Silvermountain (Skt A to XP 2600) = £17.63 from www.microdirect.co.uk . Also a Thermal Take Volcano9 AMD Cooler +copper base +temp. sensor for £14.10.There is a Global Win cooler that caught my eye due to the copper h/sink,those 'splayed' ,fanned out copper fins are very effective!. The cooler is a Global Win Super Quiet Copper = £28.20,slighly more expensive but much less noise,not that the others are noisy also the cooling qualities of copper is first-class.