32- or 64-bit Kernel Startup Mode Selector

Doesn't work in 10.8

Works fine in 10.7

32- or 64-bit Kernel Startup Mode Selector

Supports iCloud

Secured by Gatekeeper

Supports retina graphics

32- or 64-bit Kernel Startup Mode Selector icon

Available on the Mac App Store
Not available on the Mac App Store

OS X 10.6 Snow Leopard is 64-bit – or is it?

Version 1.6.0
Developer Markus Winter
Website http://www.ahatfullofsky.comuv.com/English/Programs/SMS/SMS.html
Status Doesn't work

0 ratings

There is no 32-bit kernel in OS X Mountain Lion, and it requires Macs that are completely 64-bit.

Archived comments

No comments.11 comments

[ afsnj]afsnjAnonymous 14 Jul 2012 22:34

Does this mean you loose all and any 64-bit benefits when switching from Lion to ML on a 2008 Mac Pro?

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[ @afsnj]@afsnjAnonymous 30 Jul 2012 20:12

No…. it means it's ONLY 64-bit

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[ Ronny MF Ho]Ronny MF HoAnonymous 03 Aug 2012 07:43

Mountain Lion runs at 64-bit only. 32- or 64-bit Kernel Startup Mode Selector cannot make it run at 32-bit.

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Lion (10.7) Comments

[ David]DavidAnonymous 27 Mar 2011 04:10

default for snow leopard is 32-bit if that is what you mean

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Allen DunahooAllen DunahooAnonymous 14 Jun 2011 11:24

Doesn't work on my system - Late 2010 MacBook Air 13" running OS X Lion DP4.

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[ Adrian]AdrianAnonymous 26 Jun 2011 10:01

It doesn't work on any late 2010 MacBook Air 13" (or 11.6") running any version of OS X. They don't allow booting 64-bit kernel on this machine (I have one too), or they have changed the way you select kernel to something nobody has figured out yet.

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[ Moritz]MoritzAnonymous 27 Jun 2011 07:37

I wouldsugggest its related to the fact, that Lion *only* runs 64-bit, so there's no need nor the possibility to change a kernel!

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[ Ross]RossAnonymous 03 Jul 2011 05:44

Moritz, Not true…I'm running a 2011 quad-core MBP with Mac OS X 10.7 (11A511) GM seed in 32-bit kernel mode.

From System Profiler-
64-bit Kernel and Extensions: No

95% of the running processes are 64-bit, but the kernel can run 32-bit.

My MacPro is also running 10.7 GM Seed in 32-bit kernel mode so the NewerTech 6G eSATA RAID card will work. With 64-bit kernel it panics just after login. 32-bit kernel it works fine.

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[ Franco]FrancoAnonymous 21 Jul 2011 15:05

it work with Mac OS X 10.7 GM upgrade to snow leopard iMac 9.1 64-bit is ok

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[ Zero]ZeroAnonymous 06 Sep 2011 01:22

Ross did you have to switcu it to 32bit or did it boot like that automatic

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[ Ray White]Ray WhiteAnonymous 08 Dec 2011 11:00

Some older Macs default to 32-bit kernel even with Lion, but 32- or 64-bit Kernel Startup Mode Selector can be used to persuade them to run the 64-bit kernel. Quite why older machines do this is a mystery that Apple don't explain…

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