I'm not risking to destroy "my precious" CSPPC with overclocking operations. I'm not willing to shorten the life of such a unique, hardly to find and costly hardware for a slight 20% gain. I prefer to have a stable, fast and long living hardware to enjoy.
For crunching numbers I have a cheapo Athlon, and for CPU intensive progs and heavy GFX load games I'm planning to get a G4 AmigaOne.
As for the proper cooling, have a look
here. ;-)
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Ecigarette