Actually the FOP32-1 uses a 60x60x25mm YS-Tech 26CFM fan that runs at 36db. The WBK68 uses a 60x60x10mm 23.7 CFM fan that generates 36.5db. The fan on the FOP32-1 is quieter and generates more air. I added Arctic Silver II on a stock FOP32-1 and it keeps my Duron 600@900Mhz (1.7v) at 36'C under full load. It likely would keep my AthlonXP about the same temp as my moddified FOP does but I wanted ultra quiet.
The WBK68, though, should perform fine as it is slightly better than the FOP design to make up for the lower CFM rated fan. I do not know how it compares to some of the newer heatsinks that are copper or use copper heatspreaders. The WBK is all aluminum. I think the Volcano 6 Cu would likely cool just as good or better and it is very cheap.
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AthlonXP 1600+ @1.5Ghz
FOP32-1 Mod w/80mm (30db)
Epox 8KHA+ KT266A
256MB Crucial DDR266
GeForce2 GTS (210/410)
Sound Blaster Audigy
Antec SX-630 Case (mod'd)
TTGI TT-350-SS 370w PS
AMD Phenom II x4 945 3Ghz | ASUS M4A77TD | 2X WD 1TB SATA 2 hard drive | 2x2GB Corsair XMS3 | nVidia GeForce 8800 GTS | ATI TV Wonder Theater Pro 550 | Antec P-160 case | Antec 650w Earth Watts | LG Blu-ray Super Drive | LG DVD RW | Windows 7 Pro
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