depends the cpu
I was trying to bench 1M at 6050 but always failed so I decided to push vtt and vdimm . I set vtt at 1.55V and vdimm at 1.91V . Cpu scaled well at least I could run 1M at 6020 so I pushed the voltages a little more ( 1.68vtt and 2.2 vdimm ) but no change . There is a weird situation with Gulftowns and 1M that's why I was pushing the voltages .
Dunno if it's the trick to push the cb at lower temps cause my chip was cb-free but with dual channel, triple channel for me was the same . Though many guys push vtt and vdimm to avoid cb with triple channel dunno if it really helps.
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