Are the 2836 and the 2837 made in different nm?

[imzyxwvu]

My Pi 3 works very well at 1.1GHz with `vcgencmd measure_volts` reporting volt=1.2375V, while my Pi 2 is running at 1GHz with volt=1.3375V and generates much less heat. So I guess 2837 is made in smaller nm. Is it correct?

EDIT: I am curious about the reason that Pi 3 works at higher clock but lower voltage.

[johnb_summers]

I have three Pi3's and four Pi2's, I have had to put fans on my Pi's 3, they seem to run about 10 degrees hotter than the pi 2.

[RaTTuS]

Pi3 has different arm core's

[imzyxwvu]

I have three Pi3's and four Pi2's, I have had to put fans on my Pi's 3, they seem to run about 10 degrees hotter than the pi 2.

You could try:

arm_freq=1100
over_voltage=-2

With these lines my Pi 3 got slower to reach 80 degress at full load on the four ARM cores.

[mikerr]

It's just the Cortex A53 (pi3) pushing out more heat than the Cortex A7 (pi2)

Interesting comparison of the two CPUs:
http://www.anandtech.com/show/8718/the- ... s-review/4

the A53 consumes a little over twice the power of an A7 core given almost the same SoC platform

[johnb_summers]

I have three Pi3's and four Pi2's, I have had to put fans on my Pi's 3, they seem to run about 10 degrees hotter than the pi 2.

You could try:

arm_freq=1100
over_voltage=-2

With these lines my Pi 3 got slower to reach 80 degress at full load on the four ARM cores.

WOW, 80 degrees, ty for the advice, the fans keep the CPU temp to between 50 and 55, the worry is that the higher the temp the shorter the life, a quote from blade runner "the candle that burns twice as bright burns half as long"

[jamesh]

All the Pi SoC's are made on on 40nm.

[johnb_summers]

EDIT: I am curious about the reason that Pi 3 works at higher clock but lower voltage.

the time it takes to go from 0 to 1 and visa versa, one way to speed the clock up is to lower the voltage. it is a method used to speed things up.

[imzyxwvu]

EDIT: I am curious about the reason that Pi 3 works at higher clock but lower voltage.

the time it takes to go from 0 to 1 and visa versa, one way to speed the clock up is to lower the voltage. it is a method used to speed things up.

When we want to overclock a Pi, why do we need to get the voltage higher?

[johnb_summers]

EDIT: I am curious about the reason that Pi 3 works at higher clock but lower voltage.

the time it takes to go from 0 to 1 and visa versa, one way to speed the clock up is to lower the voltage. it is a method used to speed things up.

When we want to overclock a Pi, why do we need to get the voltage higher?

I think a chip designer would be best to answer that, it could be a method of stepping up the clock but lowering it if you see what I mean, in other words the step speeds it up to much so increasing the voltage lowers it but the result is still higher than the default, that was just a guess, so I could be wrong

[imzyxwvu]

the time it takes to go from 0 to 1 and visa versa, one way to speed the clock up is to lower the voltage. it is a method used to speed things up.

When we want to overclock a Pi, why do we need to get the voltage higher?

I think a chip designer would be best to answer that, it could be a method of stepping up the clock but lowering it if you see what I mean, in other words the step speeds it up to much so increasing the voltage lowers it but the result is still higher than the default, that was just a guess, so I could be wrong

Still thanks. I will dig into it myself.