I took off the cooler and applied again the thermal grease (this time much less) according to the instructions from Arctic.
Then I've installed a second fan on the Ninja for a push-and-pull airflow towards the back of the case where there's anoter fan pulling out air.
Fan/Case set-up
Ninja: 1 x 1300 RPM blowing air / 1 x 800 RPM pulling
Case (all fans at 800 RPM): 1 x top pulling, 1 x back pulling, 1 x front pushing, 1 x bottom of the case directed towards to the PSU pushing (the PSU always stays cool and quiet)
The push-pull set-up on the cooler and the newly applied thermal grease only gave me an improvement of 3-4°, which is not much considering the set-up. Under prime load @ 9*355/Vcore 1.29 the 4 core are now at 62-67°
Improment at idle is even less (1-2°). If I lower the RPM on the pushing fan at the cooler also to 800 RPM then the temps are over 70° on full load.
So, I belive I've done everything (beside lapping the IHS) to improve the temperatures and my assumption so far is, that the Ninja is not made to cool OC processors, but is excellent when it comes to have a quiet non-OC set-up. Maybe I should switch to another cooler for that reason. I've seen other reports and tests, cooling down a Q6600 Q0 to below 50° with a OC of 9*333 or higher (not water cooling).
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