I've just (after nearly 2 days of trouble shooting) managed to find the real temp for the northbridge. Utilities like Speedfan, Everest and Sandra report the northbridge temp as 80c! I've done a 'physical' check (basically feeling with my hand) and found nothing running that hot. In fact the northbridge heatsink was only slightly warm. I've also used Gigabytes own monitering utility and this reports a temp of 36c. This is backed up by the bios which also reports the same temp. So after a near panic I now know that the above utilities were reporting the wrong temps as I really didn't want to return the board....phew

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