I'm having the same problem and search working driver for QLogic QLE2462. The last driver is only for 10.5.x Leopard. I write the QLogic support and they said the decision came from marketing department. If QLogic drop support the drivers so fast, I believe people will abandon QLogic as they are not committed to support the users.
Please let our voice heard. There should be more people write QLogic on this matter.