I am looking ath the ATI 9250, X1300 or Nvidea Geforce FX5200 for a PCI card with DVI out.
Looks like the FX 5200 is very old technology in comparison with the X1300? Cannot find comparison on graphics charts on Tom's either.
Would prefer low power consumption as only have 200 W supply (but could rig a bigger PS if necesssary).
I'm not running games but need a decent card with DVI capable of 1680 by 1050 for 20" LCD. Note that this is available on the FX 5200 (according to NVidia on their driver download page) but cannot find the same info on the X1300 (ATI) site.
My on boards graphics (SIS 651) won't support the required resolution (even with latest drivers) and has problems (weird colours sometimes in text and also some 'fuzziness' on alternate lines on VGA out - DVI is OK but resolution problem) and I only have PCI slots (2) on the ASUS.
performance wise im pretty sure the 5700Ultra was the fastet Pci card, not sure about the power reqs. i would just go for the cheapest one if performance dosent matter. and if your positive one supports it and the other dosent just buy it.
I have a 9250 and it will post those resolutions. the 1300 will too if I am not mistaken. If only b/c the FX gen cards sucked soooo bad, stay away. The 1300 will use less power than the others (newer, smaller process) I believe, but all 3 will do what you need. (you may want to double check my claims on power, I am only going off of memory on the process/power reqs for each)
the 1300 would be max for pci, as anything more would go unused... the 1300 is my gut call for what you should get though.
IMO, a good way to start on figuring what works best would be simply look at the best GPU of the same generation as the machine. You will probably not find most of them still in production, but it gives you a solid baseline. As I do not think there is any "calculation" that will get you the upgrade ceiling you are looking for I think that is the best way.
Once you have that baseline, look at a revision or two newer (or "tier" as in the toms video card hierarchy table on the "best card for the money" articles) as the THEORETICAL max for gaming. If you are not after gaming, then any of the above mentioned video cards will do. My method of course assumes you have knowledge of the video card market history and know how to look at the tom's chart. Happy hunting.