I found this solution
You will need to download MSI Afterburner from here: http://event.msi.com/vga/afterburner/download.htm
Once you have download, installed and run the software you will see your clock speeds.
If you can take a screenshot of it and post it on here, we can work from that.
It will be a choice for you, you could either increase the voltage to get it working and keep your overclocked speeds, which has a slight element of risk or you could down clock the general speeds of the card, safer but with a slight performance drop depending on how much it has been overclocked.