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I have been googling my brains out and cannot find the equation for C/W is there anyone out there who know's this?
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Formulas
- Thread starter repilce
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From the overclockers.com site,
"To calculate what to expect for other CPUs, for every watt the CPU radiates, the heatsink will cool the core by the (C/W x watts) plus ambient temp. For example, at a fan inlet temp of 25 C, a C/W of 0.25 with a CPU radiating 50 watts means that the CPU temp will be 50 x 0.25 = 12.5 C over ambient temp, or 37.5 C."
I hope that helps!
"To calculate what to expect for other CPUs, for every watt the CPU radiates, the heatsink will cool the core by the (C/W x watts) plus ambient temp. For example, at a fan inlet temp of 25 C, a C/W of 0.25 with a CPU radiating 50 watts means that the CPU temp will be 50 x 0.25 = 12.5 C over ambient temp, or 37.5 C."
I hope that helps!
OP
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yeh it does, a little backwards of what i was looking for but i was able to turn it into an expression and pull what i wanted with a little basic algebra 
gusgizmo
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i think c/w is derived empirically (s/p?), and that it would be difficult at best to find mathematically. make yourself a simulator! just for kicks.
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repilce said:yeh it does, a little backwards of what i was looking for but i was able to turn it into an expression and pull what i wanted with a little basic algebra
Sorry 'bout that, what exactly are you trying to find out?
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everclock said:
Think about what?
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Yeah, well now I'm confused. Back on topic! Repilce, have you solved your problem?
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I believe what you'd want is:
C/W = (Load_Temp - Idle_Temp) / (Load_Watts - Idle_Watts),
as you're trying to see what an increase in X watts will do to your temps. For all practical purposes, you could set Idle_Watts pretty low, even to zero if you can't find data for it. If your CPU manufacturer has posted a thermal wattage for full load at stock speed, you can estimate Load_Watts for an overclock of P% by
(1+P/100)*Stock_Load_Watts
I'm assuming this is approximately what you got? -- Paul
C/W = (Load_Temp - Idle_Temp) / (Load_Watts - Idle_Watts),
as you're trying to see what an increase in X watts will do to your temps. For all practical purposes, you could set Idle_Watts pretty low, even to zero if you can't find data for it. If your CPU manufacturer has posted a thermal wattage for full load at stock speed, you can estimate Load_Watts for an overclock of P% by
(1+P/100)*Stock_Load_Watts
I'm assuming this is approximately what you got? -- Paul
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