By using the common formula which cooling product makers use to calculate chip power dissipation and cooling ratings. Same with whats used to build phase change units and so on although most common people don't know of it. Take my example.
Phenom 9500 95W TDP chip has 18.9A per core @ 1.232V = 93W
Using 95W as reference stock chip power, say I oc'd to 2.5GHz at 1.4V:
95 x (2500/2200) x (1.4²/1.232²)
139.4W power
Code:
Pn = Pt x (vn/vt) x (Un²/Ut²)
TDP - thermal design point (Pt = Power [W])
Default Voltage (Ut = Voltage [V])
Default Frequency (νt = Frequency [MHz])
Overclocked Voltage (Un = [V])
Overclocked Frequency (vn = [V])
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