I'm getting a double wide PC graphics card today and I want to put it in the first slot. I want the 2600 in the 3rd slot to minimize heat issues. Will the 2600 work with OSX fine in the 3rd slot? (is this an 8x lane?). I know that 4 2600's work fine but want to make sure that one will have full functionality when not in the 16x PCIe 2.0 slot. Thanks.