Question regarding PCH

I googled around a bit about my i7 860 and what other kinds of O.C others had succeded with and during some of these reads they mention that they increase PCH to get a stable system and one used as high as 1.25 and only 1.18 vcore to achieve 3.8 ghz I belive it was, while I read other guides and peoples toughts and they never touch PCH or PPL, so im a bit confused so to say. I run these settings now and I ran prime95 for 1 hour and 12 min with 0 errors

vcore = 1.25
IMC/VTT = 1.15
Dram = 1.5
PPL = 1.9
PCH = 1.15

20x190

I only got 1 option with the PCH either 1.05 or 1.15

Highest core was 70c and lowest core was 66c. So what do you guys think about this setting for 24/7 use? or do I damage my computer by having the PCH at that setting?

Well 70c is not that dangerous but better keep it under 70c.
GOOD LUCK . . . DO check once again with stress test that it should not exceed 70c under full load