MBP 2.0Ghz Locked to 1.0Ghz When Running Without Battery ???

I dunno, but can you feel any difference? A cut in half would be significant, and anyone would be able to notice...

In system preferences go to Energy Saver and select the Battery option from the drop down list. Go to the Options tab and see what it says under "Processor Performance". By default when on batteries it is in "reduced" mode, so the battery lasts longer. Try setting it to highest if you want the absolute highest CPU performance constantly, or automatic for it to adapt more when needed.

Does this solve the problem your having?

I don't have a Core Duo so don't know how different the dual cores will act compared to a PB G4 1.5GHz.

It's a known issue. It's actually a fail-safe built into the system.

Make a search in the Apple Support Forum to see that it is well documented.

Pressure said:

It's a known issue. It's actually a fail-safe built into the system.

Make a search in the Apple Support Forum to see that it is well documented.

Click to expand...

Is this due to the new Intel architecture, or was it also an issue on the PB's?

Er det her på grund den nye Intel arkitektur, eller var det også et problem PowerBooks?

Josias said:

Is this due to the new Intel architecture, or was it also an issue on the PB's?

Er det her på grund den nye Intel arkitektur, eller var det også et problem PowerBooks?

Click to expand...

It's a safety feature.

There are several explanations. One is that the battery functions as a surge protector and takes any excess power and keeps the flow to the computer smooth. Removing the battery makes the processor especially vulnerable to power spikes, which can fry your computer and that could be the reason why it clocks itself down to 1.0Ghz.

The Intel Core Duo Processor and Intel Core Solo Processor on 65 nm Process Datasheet May 2006 also says this on page 86:

"With a properly designed and characterized thermal solution, it is anticipated that the TCC would only be activated for very short periods of time when running the most power intensive applications. The processor performance impact due to these brief periods of TCC activation is expected to be minor and hence not detectable. An under- designed thermal solution that is not able to prevent excessive activation of the TCC in the anticipated ambient environment may cause a noticeable performance loss, and may affect the long-term reliability of the processor. In addition, a thermal solution that is significantly under designed may not be capable of cooling the processor even when the TCC is active continuously."

On the next page it say the following:

"The TCC may also be activated via on-demand mode. If bit 4 of the ACPI Intel Thermal Monitor control register is written to a 1, the TCC will be activated immediately, independent of the processor temperature."

So removing the battery could tricker the TCC.

I don't think he meant he removed the battery just unplugged the charging cord.

QuarterSwede said:

I don't think he meant he removed the battery just unplugged the charging cord.

Click to expand...

That's what I thought too...just unplugging the power cable.

Could the OP verify?