My 83-year old neighbour likes to play games such as Civilisation 4 and Football Manager 2008, 2009 and 2010 (I think that's what he said anyway - I'm not into games).
He has a tower unit based on a Gigabyte GA-VM900M motherboard, which is a Socket 775 (LGA775) board, and I think it has an Intel Core 2 Duo processor in it.
His nephew told him that his games would look and perform much better if he had a better graphics card, rather than the integrated graphics. I've been trying to help him decide what to get but, not being a gamer myself, it's such a bloody bewildering minefield of choices that my head hurts!!
He hasn't got a great deal of money so a new machine is out of the question, but he doesn't need it anyway as he won't be going for the latest, greatest games, just the ones I mentioned above.
There's a PCI-e x16 slot on the board and someone suggested that the best card that motherboard would take would be an AMD Radeon HD6870. There's a few on Ebay, such as this one
I don't want him to spend more money than necessary but I want him to be able to play his games better than he can now, but this really is not my area of expertise, so any help would be gratefully received.