ati stops making cards after a while.

if it isnt listed on ati's website - its gone

your options are here:

http://ati.amd.com/products/mac.html

and their online shop-
http://shop.ati.com/searchresults.asp?dept_id=31
shows out of stock on everything except x1900-

you might try calling an apple dealer- to see if any service parts are available?

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i would say there is no long term viability for computer products in any market.
products typically have life cycles between6 months and 18 months - its hard for everyone -
chip makers stop making chips-

for end users - you have to move to the latest technology - otherwise you are out of the game -
not much use for a long term show -