CPU speed re[prting in windows vista

Hi I have a core 2 duo e6300 running on intel 965 motherboard. I have windows vista installed. Though I have disabled speed step Cpu z still shows the processor speed runnning on 1598Mhz sometimes jumping to 2133 Mhz and back. though there no such problem in windows Xp.

Can someone tell me how stop windows vista from downclocking the processor amd I have tried the power settings mode.

It does sound like it's still enabled in the BIOS. Vista has power management turned on by default whereas XP does not. Hence why XP runs at full speed and Vista throttles.

Once disabled in the BIOS though, both should be the same.

EIST is disabled and there is no option of C1E in the bios and I hve tried tinkering with the power settings. but still CPU Z is reporting my processor running at 1600 MHz instead of 2133

Vista does not and can not downclock a processor. This is a function of the Bios, not the operating system. Please gp into your Bios and correct your power saving options.

@OP>what Grimmy said. In Control Panel/Power Options the default setting is 'balanced' which will downclock the processor when it can to save power. Select 'high peformance' to avoid the downclock. I know, this happened to me yesterday when I reformatted and reinstalled VISTA 64.

If you want to try,

Be sure that in the bios:

1.) C1E = Disabled
2.) EIST = Enabled

The default settings in power options I see:

Minimal Power Managment - will cause multiplier to drop as well as the vcore at idle
Always On - will cause the multiplier to be at stock even when the PC is idle.

I just double checked my settings, and it does work for me. Thing is if those options are missing/deleted, not sure if that will work right anymore, by creating a new one.

But if you do want it to run at full speed all the time, and the above doesn't work, both C1E/EIST need to be disabled in the bios, although not all bios may have it, like a brand name or perhaps laptop since its designed to run on battery power perhaps.