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Me too, now to get more P-states! I've only got X16-X37 with iMac12, 2 system definition and a generated SSDT.

No SpeedStep Even After Patched Bios Both of these worked! Love the SSDT generator. Thank you guys for all your help, I really appreciate it. Now I can run 10.8.3 flawlessly.

When booting from your Uni-beast flashdrive, at the slash screen (aka the bootloader with the apple logo) press the down arrow key and select Verbose Mode. Take a picture of the Kernel Panic and upload it here.

Can you tell us what happens when you boot with -v?

Well with no luck or help onsite my desperate cries remain. I've got 10.7.5 Lion installed and I am receiving no P-States or Speed Step at all. I have patched my Bios to the latest, 1604 from here : http://biosrepo.wordpress.com/ Here is the strange thing, sleep works. I've also changed...

Clearly I had to find out for myself. Booted in Verbose mode got something like "P-state Stepper Error 18 at Step 2 in context 2 on CPU" replaced applecpupower.kext with one from 10.7.3 speedstep works like a charm. I get all p-states too on 3,1 Mac pro. Geekbench scores are 9278 with stock...

I know I've like triple posted here but I need to defeat this damn issue. Would possibly making myself a DSDT.aml help? It seems like very few people run SB on the maximus gene V.

Not sure if this helps at all but speedstep and sleep works flawlessly in 10.7.5.

I'm sure you've tried this before but what if you plug it in a different USB port. You could probably boot into the External E-Drive and repair it from the 10.7.5 install.

Well, I mean sure. Good idea. Fixed. You have any ideas? I have tried 12,2 iMac and 3,1 Mac Pro. I heard a lot people with success on Sandy Bridge with 12,1 iMac but I am unsure since they all have Z67 and p67 mobos.

Pardon my ignorance here, but have you tried installing without the graphics card plugged in?

Good Morning, I've been running 10.8.2 for awhile now using a couple of guides. (For Anyone Curious) http://www.tonymacx86.com/golden-builds/73818-success-gabedamiens-first-build-maximus-v-gene-3770k-16gb-ram-gtx-670-ft03-os-x-10-8-a.html#post458006...