How to disable SpeedStep/XCPM on Macbook Pro 11,1 OSX 10.10.2?
So, after researching more and trying other methods, what can I say:


How to disable the SpeedStep when using MacBook Pro without a battery? and it's answer pointing to “Fixing” kernel_task CPU Problems in MacOS 10.7/10.8 will help you with problems where processes take a lot of percentage from the processing time. Doing the trick will turn your macbook useable, but the Ghz will stay at minimum.
The new kernel power management works only from Ivy Bridge forward, so Macs equiped with Sandy Bridge or older processors still using the old power management and therefore the kernel patch won't work.
Removing AppleIntelPowerManagement kexts won't help, and NullCPUPowerManagement won't help too… I still get the same 0.8Ghz.
Using apps like SMCFanControl will help with controlling the fans, so any reply that helps getting the original clock are welcome as the chance of burning the processor due to heat are diminished.


So for now I think that will be all. If I get any solution to work, I will report it here!