Well the only reason I am using usb on Leopard is because my two built in LAN lines on my nForce mobo don't work on Leopard and also my D-Link Ethernet card also doesn't work on Leopard, however it works on Tiger.

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CPU: Phenom x3 8650 @2.54 ghz
Mobo: ASUS M3N HT-Deluxe 780i SLI
3 GB 800 OCZ RAM
Lawless 10.5.4 w/ Voodoo Kernel