StephanZcat,
I've been out of town for a bit and just saw your post and links. I'll do some research and see if I can come up with something. ...and maybe we can get some other experts in here.
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JBernstein:
Apple usually has a disclaimer about all 3rd party upgrades to Mac's that states they 'do not support them'. So, if it's not for sale at the Apple Store or a Dealer, "It's not supported" - even if it works just fine. For Apple Authorized Do-it-Yourself upgrades there is a page you can access:
http://www.apple.com/support/diy/
There are many sites that track Mac upgrades, I'll list a few.
For 3rd party upgrades and issues, look at:
http://www.xlr8yourmac.com/
http://www.barefeats.com/
http://eshop.macsales.com/benchmark/index.cfm
BTW, your 20' just needs at least a 32MB Video card to push it. Here's a list of most cards that will fit in your 'Sawtooth'. It's set up for Apple Cubes but the information may be helpful in
seeing the differences in video cards
http://www.cubeowner.com/forums/index.php?act=Attach&type=post&id=1327
Note: Your Sawtooth's motherboard does NOT support ADC connections. There is no power supply for them. You will have to make sure whatever Video card you get has DVI and VGA (not ADC).
Look at this for compatible video cards for a Sawtooth:
http://eshop.macsales.com/MyOWC/Upgrades.cfm?model=166&type=Video&TI=%23TimeForm at%28Now%28%29%2C&shoupgrds=ShowUpgrades
Finally, there are a host of 'flashed' PC video cards available for Mac's on Ebay. I have a few and most work fine. If you want to see some options, I suggest you look at what a seller named 'yoyomarv' has for sale. Ask questions before you buy. A card you might consider is a converted NVidia Geforce 4 Ti 4600
It's a start...
Dave