Jump to content

OS X Mavericks with Overclocks

acpi kernel panic overclock

Best Answer aphex6b, 10 February 2014 - 01:26 AM

the problem is not with osx or chameleon, both will let you boot 4.40 ghz fine. My guess is the "Unable to find driver" / acpi related boot errors are due to wrong boot loader settings (GenerateC / PStates ), or non correct smbios definition.Also the most exciting new features in the Z87 / mavericks are based on energysaving, what i meant is oc'ing your 4770K is fine but no need to turn the energy saving features off imho

Go to the full post


  • Please log in to reply
4 replies to this topic

#1
shrieken213

shrieken213

    InsanelyMac Protégé

  • Members
  • PipPip
  • 73 posts
  • Gender:Male

So I've been running Mavericks 10.9.1 via vanilla install on this build for a couple weeks now:

Gigabyte GA-Z87MX-D3H

Gigabyte GTX 770 4GB

i7-4770K

And for a while I never even needed boot flags to boot properly. Now I tried to overclock the CPU, and for a while OS X recognized this as well since HWMonitor was able to see both the increased Vcore and multiplier fine.

 

I dual boot with Windows, so I also have to stress test the overclock for stability. I found that 4.4Ghz was extremely unstable, so I raised the VRIN and VRING  to 1.9V and 1.155V respectively (~0.1V bump each), turned off all C-states and EIST. Now the computer can pass 12+ hours of prime95 blend.

 

But the problem is with OS X. Whenever I boot with this configuration, I get a kernel panic before anything can load: "Unable to find driver for this platform: "ACPI/"" or something of the like. Every time the source of the crash is com.driver.AppleACPIPlatform. I read that this might be a problem with DSDT, but right now I am running a DSDT-free installation so that can't be it. I tried booting with acpi=no/null/off/etc., -x, -f, etc. to no avail.

 

What is even more interesting is that now OS X cannot even handle ANY overclock; it will only boot in optimized defaults. Whereas before OS X could handle sizable bumps in multiplier and Vcore (47x and 1.36V), even a 1x bump or 0.01V increase now causes a kernel panic with the same aforementioned error.

 

I tried using the patched AppleACPIPlatform.kext by crunk, and that didn't help at all either.

 

Does anyone have any idea why this is happening?



#2
shrieken213

shrieken213

    InsanelyMac Protégé

  • Members
  • PipPip
  • 73 posts
  • Gender:Male

I just experimented with the multipliers. It seems I cannot boot to OS X when it is clocked beyond 4.4Ghz. I turned the multiplier down by 1 (4.3Ghz) and OS X boots fine.

What's even more interesting is that at 4.5Ghz, Chameleon fails to boot at all, giving a memory allocation error at address 0x320 and the "This is a non recoverable errorSystem HALTED!!!" message. This leads me to believe that perhaps it is not OS X but rather Chameleon that is not able to keep up with the high clocks.

Memory is currently clocked at 1600Mhz; I'll try boosting the memory frequency to see if it solves the allocation error.



#3
Maniac10

Maniac10

    InsanelyMac Deity

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 1,982 posts
  • Gender:Not Telling
Perhaps you're loading a SSDT which doesn't correspond with the overclocked values? You can try Clover to discard a bootloader problem.

#4
aphex6b

aphex6b

    InsanelyMac Geek

  • Members
  • PipPipPip
  • 123 posts
  • Gender:Male

Best Answer

the problem is not with osx or chameleon, both will let you boot 4.40 ghz fine. My guess is the "Unable to find driver" / acpi related boot errors are due to wrong boot loader settings (GenerateC / PStates ), or non correct smbios definition.Also the most exciting new features in the Z87 / mavericks are based on energysaving, what i meant is oc'ing your 4770K is fine but no need to turn the energy saving features off imho



#5
shrieken213

shrieken213

    InsanelyMac Protégé

  • Members
  • PipPip
  • 73 posts
  • Gender:Male

the problem is not with osx or chameleon, both will let you boot 4.40 ghz fine. My guess is the "Unable to find driver" / acpi related boot errors are due to wrong boot loader settings (GenerateC / PStates ), or non correct smbios definition.Also the most exciting new features in the Z87 / mavericks are based on energysaving, what i meant is oc'ing your 4770K is fine but no need to turn the energy saving features off imho

The issue was the C-state and P-state generators. Once those are disabled, the Hack was able to boot correctly, although the clock speed under "About This Mac" was capped at 4.3Ghz.







Also tagged with one or more of these keywords: acpi, kernel panic, overclock


0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

© 2017 InsanelyMac  |   News  |   Forum  |   Downloads  |   OSx86 Wiki  |   Designed by Ed Gain  |   Logo by irfan  |   Privacy Policy