I am the proud owner of Sawtooths as many of you know. These were the last PowerMac to have 10/100BT ethernet. I bought a Trendnet TEG-PCITXR PCI gigabit ethernet card for only $12 on ebay and it arrived today. I am proud to say that it works perfectly and uses built in drivers found in 10.5.2+. Here is a product page for it: http://www.trendnet.com/products/proddetail.asp?prod=140_TEG-PCITXR&cat=14 It lists nothing about mac compatibility but I read on a couple different sites that these worked in 10.5.2+ so I gave one a try. Glad I did. It's also a great idea for firewall systems that need 2 ethernet or even a PowerMac with dead onboard eth. So any PowerMac with PCI and 10.5 can easily benefit from this card. I am loving the true gigabit speed. It makes network drives perform like local drives.