Hi. The card I'm looking at is described at OWC as an ATI Technologies RADEON 9200 128MB MacEdition PCI Graphics Card with VGA, DVI, S-Video. It gets pretty confusing trying to find a card for this machine, particularly since, like mentioned here, the Sawtooth machine didn't come with the dual 500s. That has me a little confused as well. My best guess is that someone may have put the dual processor in it later on. I was really hoping that my machine wasn't a Sawtooth, but the audio jacks are vertical and below the USB ports, which is supposed to be the earmark of a Sawtooth. Also, when I run the system profiler the hardware overview describes it as a Power Mac G4 (AGP Graphics), Model identifier: PowerMac 3,1. I tried running the serial number through Apple's site and it couldn't identify the machine (don't know why that would be), but when I run it through a site called Chipmunk.nl, it comes back as a Power Mac G4 400MHz/450MHz/500MHz CTO. Says it was built in Elk Grove/Sacramento, and was built in production week 22 (June of 2000). That all pretty much adds up to Sawtooth as far as I can tell. I really don't know how to tell if the processor I pulled from it is an original Apple card or not. A magnifying glass reveals XPC7400, and RX500PK on each chip. Aside from a sticker with a long serial number and "Singapore P15 500", I don't see much else to help determine if this was an original Apple processor that was swapped into this machine, or if it was an early aftermarket upgrade. The heat sink looks identical to the pics I've seen of the Apple dual units that came in the gigabit machines. So, aside from the fact that it had the dual 500 processor, all other fingers point to Sawtooth. So if that's the case (unless I'm missing something) swapping boards isn't going to be a simple process from what I gather. Maybe my best bet would be to pick up a cheap gigabit or digital audio machine off of E-bay, put all of my goodies like the USB2 card, the larger internal drives, the DL DVD burner, processor, extra RAM, etc. into that, then put the dual card back in the Sawtooth and sell it to someone else on E-Bay. Probably the easiest route, I suppose. I really have to get by on the cheap, but I also want to put together the best unit I can manage on an ultra-tight budget. I guess one remaining question is, one of my 512mb dimms is a PC100, unlike the rest which are 133s. Anyone know if the DAs or GBs have a problem with PC100, or would I be looking at losing use of that dimm? Also, I really appreciate you guys offering your opinions and help. You're great!