Which one, if any, generates more heat? I'm playing around with my i5-750 and having trouble keeping heat in check - mainly because of my ITX case.
Voltage. Just increasing the clock or the multiplier shouldn't really affect the heat by a large amount (assuming you don't have your volts on auto).
Not including voltage..... I'm currently running it at @ 3.45Ghz @ 1.1250v - think the default is 1.1675v
id say they are close enough as to be indistinguishable. as bartaggio said, neither BCLK nor multiplier will effect heat fractionally as much as voltage does.
With my I7 950 I found it needed more Volts when overclocking with the bclk. 4ghz 1.4vcore x20 multi 200 bclk 4ghz 1.385 x24 multi 167 bclk So with less Vcore using multi meant lower temps. Only about 1/2c though.
im guessing you mean baseclock not FSB i guess it would be close but id say multi overclocking is slightly cooler although i bet its not alot due to the extra mobo volts needed to keep it stable at higher baseclock
Baseclock. Because everything gets overclocked. Higher frequency = more power. That's why laptops only ever use the the lowest frequencies where they can get away with it (think DDR3 speeds). Outside of a laptop though it won't really matter that much - voltage to any component is your biggest heat source.
