Alpha ships its fan/heatsink combos with Sanyo Denki fans, but many retailers bundle the Alpha heatsinks with YS Tech fans, supplied by Global WIN, because they are both cheaper and more efficient. We have tested the Alpha heatsinks with both fans.
 
 

The older version PAL6035 is not Coppermine compatible; however the newer FC-PAL6035 is. The difference between PAL and FC-PAL is the base plate - on the left, you can see the PAL6035 base plate, on the right the FC-PAL / PEP66 base, with its little plastic feet. Of course the FC-PAL will also fit classic PPGA CPUs, so if you have the choice, go with the FC-PAL, as it's a safer investment.
 
 

Conclusion
 
 

The FC-PAL6035 with YS Tech fans  is the top choice for overclockers who want good performance, but do not care about high noise and are willing to pay a relatively high price for a heatsink. But keep in mind that the FC-PAL6035 with Sanyo Denki fans will provide very similar performance with less noise. A problem with the FC-PAL6035 is that it is quite high, and depending on the motherboard, it will block up to two DIMM slots when it is installed on slotket. Therefore Alpha also offers the PEP66, which is better for slotket configurations.