Urgh...I do just want to play FFXIV on it. I figured since the card itself is a few steps above the minimum spec it would be okay.
Well the problem you have with this type of setup is:
1) It might just barely meet minimum. It also might not. What happens if you buy this card, hook it up, and the benchmark still comes back under 2000? Or worse, under 1500? You've gone and spent money on a new part that isn't going to provide you with the performance you were hoping to get out of it.
2) The rest of your components have a pretty low ceiling in terms up upgrading. DDR2 800 RAM is rather slow for gaming, and you can never go beyond that. XIV also shows a pretty big jump in performance in terms of benchmark scores going from dual to quad core and your motherboard is not compatible with any quad cores.
Let's assume you go ahead and buy the card, eventually you would have to replace the motherboard/ram/processor to get the game to run well anyway. And at that point, you might have a pretty good rig except for your card, which you would find yourself replacing again. Meaning that you have to go buy another new card before this one starts getting dust on it. You're now left with a relatively new card that you can't do anything with unless you're going to set this computer up as a backup/spare system).
Most people who are posting low scores with a dual core and a GTS or even a quad core and a GTS, the first thing I would say to them is to upgrade the GTS. So what you're doing is you're buying a card that many other people are currently using and are trying to upgrade out of to get XIV to run.
I would strongly suggest saving your money until you can afford to replace the MB/RAM/CPU/GPU (And power supply if needed) all at once, rather than replacing things one at a time. Prices tend to go down over time, not up, so if you started saving now and bought all the stuff you need in early/mid September, prices might have dropped.
If you feel yuo must buy a card now, the price on that card was about £110, which works out to about $160ish? For $160-170, you could get a Radeon 5770, which is a huge improvement over the GTS 250 for the same price, or only slightly more. If you wanted to bump that up to $199 (about £130-135?), you could get a GTX 460.
Again, your motherboard/processor/RAM will still be a bottleneck, but If you're going to buy a new card, I really advise -not- buying a GTS for XIV. Edited, Jul 17th 2010 6:37am by Mikhalia