I delidded my i5-3570k and wanted to see if shimming made a difference. I'm running overclocked at 4.4ghz, 1.18v. My temps running IBT at Very High setting:
Before delidding: 76, 88, 86, 82
After delidding (no shim): 64, 77, 75, 69
with single sheet of 24lb paper shim: 76, 93, 90, 84...