I have purchased a retail pentium 3 cpu from comp-u-plus with no problems. This price is pretty good for a retail 1.4 athlon. The standard heatsink will work fine if you don't plan on overclocking. When I overclock, I add an extra fan on the back of the heatsink blowing air from the back of the case towards the heatsink, using mounting tape to attach it to the heatsink. This reduces the cpu temp about 3-4 degrees.