mjgunn Posted April 4, 2011 Share Posted April 4, 2011 I've been at this for a few hours now, mostly been following information over on Tonymac's forums. They're all successfully running their SB systems with the new Kernel, however they have to lower the multiplier on their CPU to 32x, underclocking their CPUs to 3.2ghz whether it's an i5 or an i7. They've figured it out now that if they install nullcpu they can change the turbo to whatever they want, and most are successfully running their machines at whatever they want. However, they still need to lower their base multiplier to 32. If they do not, the machine goes into a reboot loop as soon as it begins to boot OS X (which is what I'm getting). This is a problem for me because I'm running this on a dell xps 8300 (got way too good a deal to pass it up and build my own machine, seem to be paying for that now though), which will not allow me to adjust the multiplier in the bios. I've noticed while reading over here however that no one mentions having to lower their multiplier, wondering if the two boards are doing things differently and you guys aren't having to lower your multiplier (can't seem to find a difference in the install methods though), or if you guys are having to lower yours as well. Link to comment https://www.insanelymac.com/forum/topic/254038-sandy-bridge-kernel-did-you-have-to-change-your-multiplier-to-32-or-no/ Share on other sites More sharing options...
Time2Retire Posted April 4, 2011 Share Posted April 4, 2011 I take it that with "multiplier" you mean the boot option "busratio=nn" which I don't have to use. Not even with my insane OC'ed rig. Might be a boot loader issue. Link to comment https://www.insanelymac.com/forum/topic/254038-sandy-bridge-kernel-did-you-have-to-change-your-multiplier-to-32-or-no/#findComment-1665921 Share on other sites More sharing options...
mjgunn Posted April 4, 2011 Author Share Posted April 4, 2011 I take it that with "multiplier" you mean the boot option "busratio=nn" which I don't have to use. Not even with my insane OC'ed rig. Might be a boot loader issue. No I mean the standard Multiplier (not the turbo) in the bios Link to comment https://www.insanelymac.com/forum/topic/254038-sandy-bridge-kernel-did-you-have-to-change-your-multiplier-to-32-or-no/#findComment-1665924 Share on other sites More sharing options...
mjgunn Posted April 5, 2011 Author Share Posted April 5, 2011 So after a lot of reading around and talking to people, it would appear people with Asus boards don't have to lower their multiplier and everyone else does. Any ideas why this is the case? Link to comment https://www.insanelymac.com/forum/topic/254038-sandy-bridge-kernel-did-you-have-to-change-your-multiplier-to-32-or-no/#findComment-1666097 Share on other sites More sharing options...
mjgunn Posted April 7, 2011 Author Share Posted April 7, 2011 making one last attempt to bump this for some attention before I let the topic die Link to comment https://www.insanelymac.com/forum/topic/254038-sandy-bridge-kernel-did-you-have-to-change-your-multiplier-to-32-or-no/#findComment-1667017 Share on other sites More sharing options...
llmnmst Posted May 17, 2011 Share Posted May 17, 2011 i think you must do the multiplier x32, kernel just don't support higher than that. hope that supports and we will wait the kernel update. I have one problem too on this underclock things. :cheers: Link to comment https://www.insanelymac.com/forum/topic/254038-sandy-bridge-kernel-did-you-have-to-change-your-multiplier-to-32-or-no/#findComment-1684977 Share on other sites More sharing options...
Recommended Posts