They still sell cards with the AX3450 chipset, but ATI's driver search is useless.  Try downloading the legacy Catalyst drivers and see if they work.  I use them for the old (three years!) card in my notebook which works well with Poser-here is the link for XP.

http://support.amd.com/us/gpudownload/windows/Legacy/Pages/radeonaiw_xp.aspx

If you are going to replace it, get an nVidia based card...

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