So my 7990 has been running well till last week. But now gpu 1 is running 10-15c hotter then gpu 2. I figure the thermal paste might need changing or at least I've heard it's not a bad idea. While I'm there I'm wondering about adding those small heatsinks on the backplate. It's incredibly hot in several spots (can't remember the name of the chips that sit there). Basically has anyone had these issues and sorted them? I figure the tiny cost of all these items shouldn't be a offput and has to achieve a slightly cooler card?! Any ideas?