14Mbps broadband limited to 3Mbps on Mac G4

I first posted this question in the AirPort Express discussion area, but I believe it belongs here instead.
I have a PowerMac G4 Dual 450 and successfully installed an original AirPort card since it won't support the AirPort Extreme, and I successfully created a network with an AirPort Express. Everything is going great, and I'm still getting almost 3Mbps through the AirPort. I understand this is all I should expect, even though the original AirPort card claimed 11Mbps?
I upgraded my broadband internet access to 14Mbps, and the PC laptop in the house easily achieves this top speed through the AirPort Express despite being downstairs and over 65 feet away. My G4, however, won't go above 3Mbps, even when I reboot and connect it directly to the cable modem with the AirPort Express turned off. There is no other computer or wired network leeching bandwidth from the Mac. Its 3Mbps connection remains the same, whether wired or wireless, regardless of the PC being logged in to the AirPort Express or not.
The modem is a brand new Motorola Surfboard that is more than capable of 14Mbps, as evident by the PC's connection.
Ethernet settings are set to "automatic," and forcing them to 100BaseT didn't help. I returned them to auto.
My original built-in ethernet port doesn't work. My ethernet cable (when not plugged into the AirPort Express) is plugged into an ethernet card that I installed. Could the card be limited to 3Mbps?
Would ethernet settings have any bearing on the AirPort?
Is there a hardware limitation in this older G4 limiting it to 3Mbps?
I'd greatly appreciate any help. Thank you.
--Jason

Good to hear you fixed the problem - I ran into somethign similar when I upgraded my service level - in my case it turned out the cable moedm I had was too old to run at the higher speeds.
It can also be useful to try multiple test sites. DSLreports is good but seems to be more of a sustained throughput type test. Internetfrog.com seems to do a better job of testing actual peak bandhwidth but over a much smaller set of test data.

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PICS
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Prince Moe wrote:
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