Temperature VS Speed — Penryn vs Menron

After playing around with different CPU, I was particular interested in the power saving technique of the CPU. It seem that the T7100 CPU could run at 3 different speed setting, 800Mhz 1.2GHz and 1.8Ghz. At each frequency the supplied voltage to the CPU is different, Using PC wizard2008 it is reported

800Mhz at 0.9V

1.2Ghz at 1.0V and

1.8Ghz at 1.175volts

The X9000 CPU however could run at many more stages

800Mhz at 0.925V

1.2G at 1V

1.6Ghz at 1.05V

2.0Ghz at 1.1V

2.4Ghz at 1.15 and

2.8Ghz at 1.2 V

From the different speed and voltage we could see the power saving between Penryn and Menrom. The newer process run at a lower voltage at 2Ghz that the Menron at 1.8Ghz.
On testing with my laptop under almost identical condition the penryn 2.8 processor could last 15 min longer that the T7100 with modest to light load. Surfing net with wireless on. And at the same time remain cooler. From my calculation the penryn CPU alone is consuming 1.48W less than the menron at this usage setting.

If I limit the CPU speed to both 1.2G using “Vista maximum processor state” the X9000 run at 44C  while the T7100 run at 54C running wPrime

At 800Mhz the X9000 runs at 34C while the T7100 runs at 48C

Under heavy load the max temp the T7100 would go is 62C at1.8G. While the X9000 would reach 70C at 2.8G
at a more sane 2.4G the X9000 would match the same temperature of T7100 at 62C. This could be the fact that the heat sink and heat pipe of the SONY SZ laptop is relatively small.

This could be why the newer SZ laptop does not have a processor running at a much higher speed. The team at SONY might have design this laptop to run at max 65C or so Temp.

Assuming Temp coefficient of the Heat Pipe is identical with fan full on. we could conclude that the 2.4 G penryn consume the same amount of power as a 1.8G menron at burn speed.

It is difficult to compare the heat dissipation at the lower speed as the fan speed is not constant. so the  temp coefficient of the heat pipe/fan combo is different.

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3 responses to “Temperature VS Speed — Penryn vs Menron

  1. Wouldn’t it make more sense to compare similar chips from the Merom and Penryn lines? The T7100 is one of the cheapest low-end merom chips and the X9000 is the highest core2 extream version. I think a better sample would be comparing a T7300 (2.0ghz, 4mb L2) or T7500 (2.2ghz, 4mb L2) merom with a T8100 (2.1ghz, 3mb L2) penryn. My casual testing shows the Penryn runs cooler and draws less power.

    • Wow, I did this so many years ago.
      Anyway Penryn uses a different bus speed, which is not supported at the time of writing by my computer.
      And also at that time Penryn is is not available as well.

      I believe the X9000 that I used is Menron and not penryn

      • Penryn released January 2008 and they did come in the same bus speeds as many meroms. I use them often in Thinkpads I work on, the T7100 is a 1.8ghz Merom with 800mhz fsb and 2mb L2 cache, the X9000 is indeed Penryn, it’s the fastest 800mhz fsb penryn chip made running native at 2.8ghz and 6mb L2 cache with an unlocked multipier so it can be easily overclocked. .

        Sorry I didn’t realize how old your comparison was, but I found it interesting and thought you’d like some feedback. Even today the Penryn CPU is a good chip and they are very affordable on the secondary markets.

        Keep up the good work.

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