The clip was backwards on my GC88. I was fooling around with it on one of my spare MB's, and I noticed that the HS wasn't sitting square on the cpu with the clip on; it was tilted. Reversed the clip, and I'm now running at 1.68v, at 2250 mhz, at 44 C with a case temp of 38 C. Under load I'm in the low 50's.