why do you want such good graphics, graphics are still good on low
Have you played it on high with dynamic lighting and etc. I have a FX5600 with most things on low, but i do get the chance to play with some higer end vidcards on occaision, and the difference is amazing. Take Kubra Dam for instance. With my card, no dynamic lighting, shadows off etc, it's ok, but on a higher end vid card the dynamic lighting on its glorious, it makes my graphics seem very bland. The effect is not very well translated in still screencaps so it's really difficult to see the difference sometimes.
Not saying it's not playable, I still enjoy it on low, so no, you don't NEED high end graphics to play, but i will be upgrading very soon.