Yes, you can. Use Coolbits -> http://downloads.guru3d.com/download.php?det=815
. All you do is unzip the file and click on the expanded file. After that a window will pop up asking if you would like to add it to the registry, you click yes and then you are good to go. Now that you have that done you can overclock and to do this you right click your desktop and go properties, then follow that through to where you would go to change the display settings of your card. Now there is a clock settings tab that has opened up on the left hand side. I would say only move it up 10 at a time and only work on one at a time, like work on Core than test and see if it good than Memory. Also i would use AquaMark3 to check for artifact, artifact will be like White-spotted "snow" in games, Mouse cursor disappears, becomes a "box of static" or leaves trails, Textures (walls etc) flash, scroll, are the wrong colours or look distorted in games and etc.