Originally Posted by m|dg3t
Hmm, will I notice a difference with it overclocked; or do I need to turn some settings up? (I barely touched it, because of no fan ><) But I moved it up from Core 249 to 253 and Memory 150 to 155. How far should I move it without a fan that would keep it safe. It's about 4 inches from the side case fan.
Play some games for awhile, if you notice atifacts, crazy squares, colors, odd shapes, anything thats not usual, then lower clock frequencies and try playing again and see if things are cleared up.
I like AtiTool .25 beta 10 (http://www.techpowerup.com/downloads/104
because it has a Scan for Artifacts feature that can tell you if you've started artifacting.
Artifacting is usually caused by too much heat but in some cases your card will start to artifact if it has reached its limit, then you need a voltage mod. But the best solution to prevent artifacting is better and more cooling. Try attaching a 80mm or even a 40mm fan to your heatsink to increase core overtclockability for example.
Edit: To tell if overclocking has improved your performance, use benchmarks such as Aquamark, 3dmark (01se, 03, or 05).
Here 3dmark01se, its a good benchmarking for your card:
Just run a benchmark before and after every overclock to see if your gaming performance is increasing.