Looks like some kind of lighting effect that's either a setting you're running lower or a feature not available with the older card. Not sure if it's really "fixable". Could be wrong though.
Look at the in-game options and then graphics settings. My bet would be "Number of Dynamic Lights" or maybe "Glow". See if those are on, the former being "Normal" and the latter "Yes".
The setting responsible for the shinyness is specular map. Look at the barrel in the screen shot you can alos notice he difference there. Post back if it causes any problems though because Ive been having slowdowns on random servers that usually go away if I turn it off.