9degrees difference switching from XP to Win 7

[mr soft]

I know Win 7 handles the power savings better, but this temp. difference is with both OS's on idle, core voltage and frequencies the same.

http://i644.photobucket.com/albums/uu164/coobydoo/Coretempshot.jpg

Can anyone dual booting with XP to Win 7 or Vista to Win 7 confirm or explain this?

[RunningSkittle]

Post screens with cpuz too...

[Audionut]

I seen no real changes myself. And that's a Vista taskbar.

[saint-francis]

There is no way that windows 7 lowers the idle temp 9 degrees C. That must be a glitch in the monitoring software somewhere. I have seen no difference between Vista, XP and Windows 7.

[mr soft]

http://i644.photobucket.com/albums/uu164/coobydoo/CPUZshotsdifferentcodenames.jpg

The code names are different, the core voltages are slightly higher in win XP, so you would expect higher temps. (but I´m not sure about 9c difference) The drivers for the win 7 setup are provided by MS, and on my XP setup they are from AMD.

And that's a Vista taskbar

Win XP and Win 7 both tweaked but no Vista ever.

There is no way that windows 7 lowers the idle temp 9 degrees C. That must be a glitch in the monitoring software somewhere. I have seen no difference between Vista, XP and Windows 7.

Hence why I was asking if any one else is experiencing this. I have tried multiple temp. monitoring software. All show the same , I also have a built in MB CPU led temp display.

27-31c Win 7, 41c XP . (core 20c win7 29c XP) Idle .

[burfadel]

The difference can come from differences in AMD's Cool 'n Quiet! Just like on Intels, where the cpu multiplier can drop to 6.0x, AMD also has this function (although the multiplier change is different). In fact, there was a good programme, and it still is, called RMclock. Its free, but unfortunately is no longer updated. It still works on Q9400's etc, not sure about AMD's. With that you can set up power states, and you only use the multiplier required for the current task. For each multiplier you can set the voltage too, so you can have fully, fast, dynamic multiplier and voltage change! This is actually a featuer that Windows supports but isn't fully utilised.

I'm guessing Windows 7 utilises power management features better (without 3rd party) for your particular CPU, hence the change in idle temp. Although it seems that the multiplier is still the same.

ONE QUESTION:
How come you're using a different verison of cpuz in Vista (1.51) as compared to Windows 7 (1.50)? ...

[tetsuo55]

run the same test with the "Core Temp 0.99.5 Beta"

And show the cpu-z with 1.51 on both systems

[GrofLuigi]

This (http://crystalmark.info/software/CrystalCPUID/index-e.html) is the "successor" to RMClock. It works with newer processors (1/2 multipliers).

Any of the two is indispensable on laptops and (I guess) useful on desktops.

Google for undervolting guide.

I wouldn't run any laptop without them.

Vista's (don't know about 7's) power management does speedstepping, but goes by the specs (which are often too conservative) for the voltages, producing unnecessary heat. :rolleyes:

GL

[burfadel]

Thats what I was suspecting was happening with the different between Vista and 7! Both RMClock (which has more features) and CrystalCPUID both require setting up, if not done properly they are both useless!

Between the two, there probably wouldn't be much different effectiveness wise, but CrystalCPUID would be more practical on very recent CPU's that aren't supported under RMclock.

They are useful for desktops and laptops, they save power :) laptops can actually get longer battery life using propery cpu dynamic management, whilst not impacting on performance :)

[mr soft]

I'm guessing Windows 7 utilises power management features better (without 3rd party) for your particular CPU, hence the change in idle temp. Although it seems that the multiplier is still the same

Cool n quiet, when enabled drops the core temp to 16c
The core voltage drops to 1.0250 and the frequency drops to 800mhz :eek: This rises and drops in real time.

I didn't realize about the different versions of CPUZ. (hasty install)
I'll install the same versions and re-test.