You mentioned that you have *NEVER* seen a CPU HSF that requires 2 FANS. So.....here you are!
Star Ice on ASUS K8 motherboard
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The Star Ice incorporated a horizontal design and bundled the unique Smart Clip Set. These two innovative features allow the fan to always point towards the chassis?f rear ventilation holes regardless of CPU locations and motherboards layouts. When the heat sink absorbs the heat generated by the CPU, the fan immediately vents out the hot air, successfully preventing the heat from circulating within the case. For extreme cooling, it also permits a second rear fan.
This Heatsink has an option to added a second FAN to it.
HW Specs
Asus A8N-SLI DX
AMD-64 FX-53
1 Gig DR400(Dual)
Asus Star Ice (CPU Cooler)
OCZ PowerStream 520PSU
2 Nvidia 6800GT SLI
Lian Li PC-V2000B MOD w blowhole