It is a regular occurrence for factory overclocked stuff to not actually work at the overclocks, only the default launch clocks. It may or may not help you, and if the card can't handle a small factory overclock then it may not last very long before it starts giving errors at stock speeds. You should download the beta for ATI Tool, the beta version will run on NVIDIA cards and search for artifacts, but do not use it to mess with clock settings.
This is unfortunately a big reason I never bought MSI, ASUS, Gigabyte, or some cheap brand of GPU cards... they don't have the infrastructure in place for a quick RMA if/when those are needed, and GPUs have to be one of the most RMA'd parts of a computer!