ATI X1600 is supposed to have shader 3.0, so Civ4 should be running well on this one. I've just upgraded my 9200 Radeon to X1550 to be able to play Neverwinter Nights 2 and other less ancient games (like MTW 2 at reasonable graphic settings) and it is working well so far and is completely compatible with everything. Just don't forget to download new drivers from ATI website and may be even uninstall the Catalyst software. The only thing needed are the drivers, that other crap coming with them is not required and it just slows everything down.
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Cujusvis hominis est errare; nullius, nisi insipientis in errore perseverare
Ciceron (Marcus Tullius)
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