eyetv should work on the iMac g4 ,1.25 ghz , 17 "
at least it does on my eMac just perfect with the pctv ulimate usb nano stick
ok the eMac is a bit faster , eMac 1.42ghz instead of 1.25 ghz in the iMac g4 ,eMac 512mb level 2 cache instead of 256mb in the iMac g4 , but vram grapics are the same in both 64mb
and eye tv has minimum requirements of usb 2.0 and osx tiger but i think they recommend 64mb graphics
but it might even work with 32mb graphics in the 15"model , but cant confirm this