I overclocked my RPi to 1GHz. It is in a case with a few holes drilled on top of the SoC. Under 100% CPU load, the temperature went up to 62-64C.
I cut a piece from an old motherboard chipset heatsink, similar to what is offered on eBay. I put it on the SoC with some thermal grease and a drop of the white glue (not sure what's it called) on the side to hold it in place. The max temperature is now around 55-56C. I would expect the open air (no case) results to be even better.
--- In Raspberry_Pi_4-Ham_RADIO@yahoogroups.com, "Lee - N9LO" <mr.olson@...> wrote:
> I see on eBay that several sellers have heat-sinks for the Raspberry Pi. Are they needed or are they just for looks. I just got my R-Pi today and have not booted it yet. Waiting for a power supply and keyboard.
> Thank you
> Lee - N9LO