My Warband keeps crashing !!!!!

[Earendil the Great]

i have an ASUS EAH4870x2  graphics card which is awesome . It plays Assassin's Creed 2 awesomely and all new games.
BUT for some reason when i play Warband for over 30mins it crashes the graphics card and brings up the VPU Recover (Catalyst Control Center)
OR this morning when i played it crashed the whole thing with green and brown lines flickering on the screen so i reseted.
anybody noticed this ??
i need help plz !!!! 
thanks

 

[unknown3056]

Did you try playing with the configurations?

 

[Earendil the Great]

yes and still it overheats the graphics card....
i dont get it please i need to play warband its awesome !!!