Lenovo Thinkpad W520

[dblackburn965]

Hey guys. I've been hackintoshing for a while, but I don't think I've posted. I'm usually able to figure things out on my own with the help of this forum and others, but this time I'm completely stumped as to how to fix my issue. My thinkpad has everything working great. Brightness control, sound, QE, trackpad, trackpoint, battery, wifi, etc. Except it's slow. I have an i7 2670qm in this particular laptop. I know that speedstop isn't working correctly. If I use nullcpu I get 800mhz. If I use an ssdt with a patched appleintelcpupowermanagement the laptop will boot to the desktop just fine, but after just a couple of minutes it hangs and I have to hold the power button down to turn it off. If there are any more details that you need I can get them to you. Any help at all would be greatly appreciated.