There are no nForce2 boards with 64 bit PCI slots as the nForce2 chipset doesn't support it and the market for nForce2 boards with 64 bit slots is close to zero.
Possibly the only AMD boards with 64 bit PCI slots are server/workstation boards.... but they are very expensive.
But if your controller also works on 32 bit PCI slots you could use it that way.
I love my Delta 60HP 7000 RPM fan that puts out more dB then CFM