Heat Difference: T9400 vs P9500

Wanting to upgrade my processor and found these two:

Intel Core 2 Duo T9400 2.53GHz Socket P 35W Processor
&
Intel Core 2 Duo P9500 2.53GHz Socket P 25W Processor


So, same speed but difference watts. What would be the difference between the two as far as heat goes? I assume the P9500 would run cooler... is that right?

And are there any other significant difference between the two to be aware of?

 

The P series usually idle higher but at 100% load run cooler. With the T series While burn testing would reveal different in real world use i only notice a 10C difference in max temperature which is still pretty high.

I went from a 3MB of Cache P7450 that idled at 42/44C to a T9600 that idles at 29 to 31C. The T9600 has a larger thermal interface, i believe due to the larger cache which probably helps the idle temp. Between those two i think they have the same cache? If so the thermal interface is probably the same size.

Im not sure if this goes for P series or not but I found my P series undervolted alot better (minimum voltage at all clocks) even while overclocked then the T9600 which will undervolt some but with myne (every single chip varies) wont overclock stable at lesser voltage.

 

Both these processors when in power saver mode down clock to more or less the same mhz.

It is only going to be at max load you might as CluthX2 wrote notice that the PXXX series run marginally cooler.

I never have my laptop at max load, not even close to it.

 

Yeah the P7450 and T9600 do have the same 6x middle multiplier and the SuperLFM 800Mhz underclock mode as well, between myne the extra cache draws a bit more power at the lower modes between yours they should be the same.

Battery life is the real gain/loss, under medium or higher use is where the battery difference is if your T series will undervolt well and your not overclocking you can sometimes make up for it.

 

Thank, y'all