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http://www.macupdate.com/download/32252/32-%2520or%252064-bit%2520kernel%2520startup%2520mode%2520selector.zip
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32- or 64-bit Kernel Startup Mode Selector... Mac OS X 10.6 Snow Leopard is 64-bit - or is it?

Well, actually Mac OS X 10.6 Snow Leopard is both 32-bit and 64-bit, and what that means for you depends on both your hardware and your settings.

I put up an accompanying website which should answer most of your questionshere.

What does this app do?

  • it shows whether you have a 32-bit or a 64-bit processor
  • it shows whether you have a 32-bit or a 64-bit EFI
  • it shows whether the MacOS X Kernel is set to boot in 32-bit or in more...

What's New

Version 1.6:
  • NEW: updated info on new Mac models
  • NEW: added bug reporter (haven't heard of any bugs but since I added it to all my apps ...)

Note: I had a report that the app ran fine on 10.5.8 but crashed on startup on 10.6 for one user. After two days of troubleshooting it turned out that the user had a kext which is NOT compatible with 10.6 in his system extension folder (he more...

Requirements

To check your configuration:
  • Intel Mac
  • Mac OS X 10.4 Tiger or later

To set the kernel\'s startup mode:

  • Intel Mac
  • MacOS X 10.6 Snow Leopard or higher
  • Admin rights (as a system file needs changing)

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32- or 64-bit Kernel Startup Mode Selector User Discussion

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Dorms Member IconReview+1
Dorms
+1

Hi,
I'm sorry but for me, it's also a wrong information about which kernel mode is on.
On my iMac 2011, it appears for a 32 bits startup but in fact it's on a 64 bits mode.
I don't know what is really done in this apps, so I went on Apple support's pages and I found
http://support.apple.com/kb/HT3770?viewlocale=en_US
All you need to know is written directly by Apple and it's so easy to get info and switch that it's no need to use this app.

Enjoy yourselves ... :)

Reply1 reply
Version 1.6
Mikael B
+0

Actually the primary idea behind software like this to give a certain way to start up the machine in the set kernel mode, not to give info on what it is. For this task "32- or 64-bit Kernel Startup Mode Selector " works fine though the wrong info in Lion is irritating.

I settled on SixtyFourSwitcer though.

Mikael B Member IconReview+414
Mikael B
+0

Does what it says, but does give the wrong info for some "Santa Rosa" MacBook Pro models at least. So one off for that.

Reply0 replies
Version 1.6
Mikael B Member IconComment+414
Mikael B
+0

I'm sorry but I have to give this app a 1. Your app gives the wrong info for my Macbook Pro, macbook 3.1, even though it identifies it correctly.

You app gives me a forbidden sign indicating my machine isn't supported for 64bit by Apple. Yet, 64bit kernel is the default for my machine.

I load 32bit only kernel extensions that only work in 32bit, not in default 64bit. So the info supplied by this app for my macbook pro is simply wrong.

Reply1 reply
Version 1.6
Mikael B
+0

Actually, the switch does work even though the given info is wrong on my system, which runs Lion 10.7.4. But this is mostly a cosmetic issue, though it is confusing for anyone not knowing how to tell in what kernel mode their system is running.

It's possible the given info was true with Snow Leopard but it isn't not anymore as far as I can tell.

If there's any way that my 64bit Lion can run seemingly in 64bit or 32 bit on a 64bit CPU when booting up in 32 kernel mode, though it's not capable of 64bit according to "32- or 64-bit Kernel Startup Mode Selector", then I'd be glad to learn this. It seems more likely you didn't update the info for all CPUs running Lion though.

Markus Winter Member IconComment+360
Markus Winter
+0

Please note that Lion and Mountain Lion have a 64bit kernel and will NOT run a 32 bit kernel - they will ignore all the switches and it is pointless to set them.

The only reason for me to leave this app available is that a lot of people are still using Snow Leo (myself included) and they might have a use for it.

Reply2 replies
Version 1.6
Mikael B
+0

Wrong. I have a 64bit processor — The Penryn — and I can start in 32bit kernel mode in Lion. I know this for sure as the drivers of my 24bit audio card doesn't run on 64bit.

The release of Mountain lIon is 64bit only.

Mikael B
+0

My apologies, I have the "Merom" processor (T7500) and nothing else.

Macdude230 Member IconComment+1
Macdude230
+0

Is there an app that would let you select 32 or 64bit at boot? Like the efi for selecting osx or win for boot camp.

Reply0 replies
Version 1.6
Roro01 Member IconComment+0
Roro01
+0

This application is completely useless!!!

A. To find out if you have a 32-bit or 64-bit Intel-based Mac -

Choose About This Mac from the Apple () menu in the upper-left menu bar, then click More Info. Open the Hardware section. Locate the Processor Name. Compare your Processor Name to information below to determine whether your Mac has a 32-bit or 64-bit processor.

Intel Core Solo 32 bit
Intel Core Duo 32 bit
Intel Core 2 Duo 64 bit
Intel Quad-Core Xeon 64 bit
Dual-Core Intel Xeon 64 bit
Quad-Core Intel Xeon 64 bit

B. To start up with a 64-bit kernel - hold 6 and 4 while starting up.

Reply2 replies
Version 1.6
Private (Developer)
+7

Holding the 6 and 4 keys does not stick - after the next restart you are back to 32 bit. For the changes to stick you need to use the terminal. My program is a wrapper for the terminal commands (so you do NOT have to use the terminal to make the changes) but also gives comprehensive information on the 32 or 64 bit state of the computer (and not just the processor like you complain, but the EFI, system and kernel state as well).

Would be nice if you had read the information provided on my website before you start complaining.

Offthewall
+3

A. Why don't you read the freaking directions?
B. Why don't you read the freaking directions?

Mitch_de Member IconComment+169
Mitch_de
+0

What .kext does the problem with 10.6 ?

Reply1 reply
Version 1.5
Private (Developer)
+0

It was an old version of PGP

Kp4bjd Member IconComment+16
Kp4bjd
+0

With my recent upgrade to 10.6.2 I have need to know which applications use only 32-bit kernel extensions and which run only 64-bit kexts, to help me decide whether to boot the native 64-bit Kernel or the old 32-bit one. Anyone posted a list?

Reply1 reply
Version 1.5
Goose
+2

Go to Activity Monitor, and you can see which applications use only 32-bit kernel extensions and which run only 64-bit kexts.

THrull Member IconComment+18
THrull
+9

There is a preference pane for system preferences: http://www.thrull.com/corner/mac/SystemModeConfigurator/ which does similar things.

Reply3 replies
Version 1.4
Private (Developer)
+17

I think you should at least mention that you are advertising your own program. What you are doing is considered very bad etiquette.

THrull
+9

I'm sorry You feel that way it was not my intention. Yes, I'm the author and few people were interested in system preferences version which is was working on for some time. Your doing great work with Your application and charity project.

Mglamb
+10

So you came here and hijacked this developer's listing just to hawk your own product? That is despicable behavior. I would never consider using any of your products now since you show such poor ethics.

robertcoogan Member IconReview+106
robertcoogan
+0

Definitely helped me out, now I have finally installed Vista (yes, I was stoopid to buy it, but I already spent the money), so I can now use Excel 2007.

The dev has done a great job of making a low maintenance, easy to use app. The inability to use some third-party apps while in 64 bit mode is annoying, but the dev built in a really obvious warning.

Reply2 replies
Version 1.4
jamieohara
+0

sure hope you bought and OEM Vista and not retail. What's wrong with Excel 2008 on the Mac? LOL

Cheers
Jamie

robertcoogan
+1

I can't do statistics on Excel 2008 for my grad school class. Not sure if the Vista I have (home premium) is OEM or not - but it runs fine, if a bit slow.

user icon+
funnyone_ger
Version 1.6
user icon-5
Smoochict
Version 1.6
user icon+23
Esekel
Version 1.6
> 3 13

Ratings

Overall
(13)
Current Version (1.x)
(13)

Details

Downloads 101,842
Version Downloads 68,615
Type Utilities / System
License Free
Date 04 Mar 2010
Platform OS X / Intel 32
Price Free
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