Macbook downclocked at half speed b/c no battery?!

[chriz74]

I was given an old Macbook 4,1 from a friend. It came without battery and with the lcd lamp broken.
I was able to save it from extinction by replacing the lamp. Then yesterday I decided to install windows 7 and I found out that the cpu is downclocked to half speed! Then looking around on google it seems this is because there is no battery mounted so it gets downclocked! This is insanity!
There are plenty of laptops from this era that work just fine without battery, I never ever found anything like this on a regular laptop pc. Is there a way to disable this absurd behavior that anyone knows of apart buying a battery?

 

[Pockett]

Under your power plan setting, is your maximum processor state 100%?

 

[Chrizx74]

Under your power plan setting, is your maximum processor state 100%?

Yes it’s all set to max and the power profile is set to max performance.

 

[BrianBaughn]

No, that is the way it is. I'm thinking your GPU may also be at half speed.

Get a battery off of Amazon...under $30. Make sure it's "returnable" as third-party batteries are hit and miss.

 

[chriz74]

No, that is the way it is. I'm thinking your GPU may also be at half speed.

Get a battery off of Amazon...under $30. Make sure it's "returnable" as third-party batteries are hit and miss.

I ordered a battery however in the meantime I tried this: removed AppleIntelCpuPowerManagement.kext & AppleIntelCpuPowerManagementClient.kext from S/L/E and installed SleepEnabler.kext (10.8 compatible) and NullCpuPowerManagement.kext. It doesn't make any difference, geekbench score is identical before and after. This behavior must be controlled at EFI level.