Originally Posted by crystalhand
Gotta say not sure if the points are worth it
it is heating my room up like you would not believe. Having two 1 CPU and 2 GPUs folding in my room are really kicking up heat. It would not be so warm if this winter was not in the 40s-50s. Definitely not looking forward to summer when even one computer at idle turns it into the high 90s
Heat produced, or "thermal waste" and electrical power consumption are directly related in computing. If you want to reduce thermal waste, reduce the power that you are consuming.
If heat and power consumption are a major concern, then running the SMP client at stock clock speeds is your best bet. If high PPD while still reducing power and heat costs is the balance you seek, then a heavily overclocked CPU running SMP alone is best. GPU clients are only useful for high PPD boosts with no thought for efficiency of any kind (electrical or thermal).
These 803X units are the most efficient PPD / Watt of all of the GPU units in terms of power consumption but they are still grossly inefficient when compared to the SMP client.
PPD on the GPU is entirely linear. A 20% increase in GPU clocks results in a 20% increase in PPD. But the power cost is non-linear and the heat produced is non-linear as well. The SMP clients, on the other hand, have the Quick Return Bonus (QRB) and with QRB factored in, a 20% increase in clock speed can result in much more than 20% increase in PPD. The power consumption and thermal waste increases from CPU overclocking also seem to be less severe on a CPU than they are on a GPU.
My conclusion, after doing a great deal of testing and posting my results in the power consumption thread linked in my signature, is that the SMP client is the only client worth considering if you are concerned about saving on electrical power. The obvious conclusion that follows that is that the SMP clients are much more thermally efficient than the GPU clients.