Holy hell your cards are running hot! I pull 840Mhash/s on each of my 6990s keeping the temps below 80. Replace the thermal pads as someone else recommended, and turn up the fan!
The VRMs are running hot, I would expect them to be rated up to 125C and shutdown around 140C-150C (at least thats what the power parts I work on do.)
130C is probably okay, but I'd look into some of the other solutions that were already mentioned. Higher temperatures means lower efficiency. My 6970s vary 20W wall power between 7AM (coolest) and 7PM (hottest).