Gigibit Ethernet Doesn't Work on Mac Pro

I have a Mac Pro (Quad Xeon) and and G5 in my office. Both have Gigabit Ethernet cards. I never worried about getting this performance when I was using an old G4 for a server, but now I've got a Mac Pro also with a Gigabit network card for a server and have upgraded my router and hub to Gigabit capable models. Yet I cannot achieve better than base 100 connections. My hub is showing a gigabit connection to the server, but both Mac production machines cannot obtain gigabit connections. Anyone have a clue. On my Mac Pro, when I set the network to automatic connection speeds I only get 10Mb link speeds based on my Network Utility. I can manually set the ethernet speed to 100Mb and it works, but if I set it to 1000Mb, the network breaks entirely (0Mb link speed). Any solutions will be greatly appreciated.

Usually, when set to auto-negotiate, the host will pick the fastest speed it can reliably support.
If you turn off auto-negotiation and manually set a specific speed, you have to set it on both ends. Therefore if you manually set the Mac to gigabit, you have to manually set the switch to that, too. The how-to for that will vary based on the make/model of switch you're using.
That doesn't necessarily explain why the Mac selects 10mbps as the speed under auto-negotiation. That usually points at either a mis-configured switch (are you sure it's gigabit?), or poor cabling that cannot support/sustain gigabit throughput.
Have you tried a different cable?

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