TDP using above formula if you know the exact current your CPU is pulling (encoded within MSR) or you just trust the manufacturer.

TDP is thermal heat dissipated rather than power draw. Power draw you can very easily measure within a good approximation using a few electrical tools.

The Phenom 9600 and below need 76A. So look at mine, 1.232V @ 76A giving 93.6W TDP.

Top rated bin: 1.25V x 76A = 95W TDP

But the B2 Phenom 9900 required 110A for the clocks. That's where the big difference in their TDP, power draw and temps. comes from which users have conjectured over many times.

That's why if you run your < 9600 BE at 2.6GHz stable, it won't reach the same power/temps as the 9900.

As for Phenom being hot, not so. I just checked another myth...

Stock cooler is not capable of dissipating heat which it draws away from the IHS, so heat becomes trap within the heatsink and aggregates causing a heatbed to form and so the core heats up more and more.

I tested Phenom 9600 BE at stock without any cooler or fan, 24C ambient.
I have already established mine switches off at 72C BIOS repeatedly.
I then had it loaded at POST (one core 100%).
Kept thermocouple at the top and sides.
After 25 seconds, thermocouple read 55C IHS and 59C at the side nearest die (hottest bit).
I then shut it off and to test if the temperature is more or lower than that read. I quickly took it out into my hand when thermocouple read 53C surface.
Measured at underside pins and it read 48C.

Yep, it was definitely around 50C, since it was very warm and low-hot to the hand holding it but not burning. I held it minimum 14 seconds and it had dropped to 50C IHS. If you are a medic, medically educated or an electrical engineering individual then you would know that by touching 63C metal for 1 second, you would be burned, 58C for 4 seconds and 55C for 10 seconds. 48C will not burn your skin until 10 minutes holding it.
[i.e. Ref. BS 4086:1966 Recommendations for - Maximum surface temperatures of heated domestic equipment, PD 6504:1983 [BSI published document] Medical information on human reaction to skin contact with hot surfaces, BS EN 563: 1994 Safety of machinery - Temperatures of touchable surfaces - Ergonomics data to establish temperature limit values for hot surfaces]

This is obviously inline, showing that the temperature even without a heatsink and fan took 25 seconds to rise to 60C, one core full load. That would show that it won't be 40C idle at stock with a heatsink and fan unless one of the components is underpowered for 95W TDP, or can just about remove 95W TDP and keep the CPU below HTC activation.

I tried the same but with a Q6600 at 3.6G 1.344V just to recheck. It jumped to 75C IHS under 11 seconds and it shut off (THERMTRIP#) before I could switch it off manually, under 16 seconds (105C). It was completely untouchable at 63C IHS reading, would burn me straight away. That was just to recheck the readings were OK.