the screenshot is too dark I can't see lower half of the screen. Anyway, black pixels are usually not signs of overheating, white/red/green dots are.. Can you correct the screenshot gamma and repost?
EDIT: OK, I did it myself, that looks like a malfunctioning pixel pipeline. It may be a heat issue or permament damage due to overclocking. You should post this in www.rage3d.com driver issue forums for more help.