32- or 64-bit Kernel Startup Mode Selector
Your rating: Now say why...

(13) 3.269230769230769

Check your system & set the kernel startup mode.   Free
Add to my Watch List
Email me when discounted
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 questions here.

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 64-bit
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 had previously installed an app, removed it, but forgot to remove the kext). So if you should experience weird crashes with ANY app on 10.6 which ran fine on 10.5.x then make sure you do not have incompatible extensions left in the system folder.

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 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)





MacUpdate - 32- or 64-bit Kernel Startup Mode Selector



32- or 64-bit Kern... User Discussion (Write a Review)
ver. 1.x:
(13)
Your rating: Now say why...
Overall:
(13)

sort: smiles | time
burypromote
+1

+1

Dorms reviewed on 11 Nov 2012
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 ... :)
[Version 1.6]

1 Reply

burypromote

+75
Mikael B replied on 04 Dec 2012
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.
burypromote

+75

Mikael B reviewed on 19 Aug 2012
Does what it says, but does give the wrong info for some "Santa Rosa" MacBook Pro models at least. So one off for that.
[Version 1.6]


burypromote

+75
Mikael B commented on 19 Aug 2012
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.
[Version 1.6]

1 Reply

burypromote

+75
Mikael B replied on 19 Aug 2012
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.
burypromote

+156
Markus Winter commented on 28 Jul 2012
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.
[Version 1.6]

2 Replies

burypromote

+75
Mikael B replied on 19 Aug 2012
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.
burypromote

+75
Mikael B replied on 19 Aug 2012
My apologies, I have the "Merom" processor (T7500) and nothing else.
burypromote
-3

-2
Macdude230 commented on 19 Jul 2010
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.
[Version 1.6]


burypromote
-11
Roro01 commented on 28 Apr 2010
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.
[Version 1.6]

2 Replies

burypromote
+7
Private (developer) replied on 12 Jun 2010
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.
burypromote
+3

+3
Offthewall replied on 08 Mar 2011
A. Why don't you read the freaking directions?
B. Why don't you read the freaking directions?
burypromote

+85
Mitch_de commented on 14 Nov 2009
What .kext does the problem with 10.6 ?
[Version 1.5]

1 Reply

burypromote
Private (developer) replied on 04 Mar 2010
It was an old version of PGP
burypromote

+13
Kp4bjd commented on 14 Nov 2009
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?
[Version 1.5]

1 Reply

burypromote
+2

+2
Goose commented on 14 Nov 2009
Go to Activity Monitor, and you can see which applications use only 32-bit kernel extensions and which run only 64-bit kexts.
burypromote
-14

-13
THrull commented on 13 Sep 2009
There is a preference pane for system preferences: http://www.thrull.com/corner/mac/SystemModeConfigurator/ which does similar things.
[Version 1.4]

3 Replies

burypromote
+13
Private (developer) replied on 15 Sep 2009
I think you should at least mention that you are advertising your own program. What you are doing is considered very bad etiquette.
burypromote
+1

-13
THrull replied on 15 Sep 2009
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.
burypromote
+4

+18
Mglamb replied on 14 Nov 2009
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.
burypromote

+57

robertcoogan reviewed on 11 Sep 2009
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.
[Version 1.4]

2 Replies

burypromote
jamieohara commented on 12 Sep 2009
sure hope you bought and OEM Vista and not retail. What's wrong with Excel 2008 on the Mac? LOL

Cheers
Jamie
burypromote

+57
robertcoogan replied on 12 Sep 2009
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.
burypromote

+10
arya had trouble on 04 Sep 2009
just an idea...
perhaps you could integrate this software (or the informations provided by this software) to the system preferences?

:-)
[Version 1.2.3]


burypromote

+10
arya had trouble on 31 Aug 2009
My macbook (MB404, early 2008) is now 64bit processor, EFI, kernel boot mode, and 32 bit kernel, with the unsupported symbol. Originally, the status was 64bit processor & EFI, 32bit kernel & boot mode. And it's said that my mac isn't supported. Can you tell me what does it mean?

I looked at the activity monitor(before i changed the kernel boot mode to 64bit) and the apple's built-in apps were running at 64bit mode. It's the same after i changed to 64bit boot mode.

My point is:
i'm curious with the unsupported status (the X) and the different status of my kernel (after i changed the kernel startup mode to 64bit).

any enlightenment for my slow brain?
[Version 1.2.3]

2 Replies

burypromote

+10
arya replied on 31 Aug 2009
oh, i forgot... here's the screenshot:

http://i120.photobucket.com/albums/o187/bootyboots/Screenshot2009-08-31at70050PM.jpg

my newbie head says:
i thought when i'm booting at 64bit kernel, the other kernel status also would show 64bit ?
burypromote
+1
Private (developer) replied on 31 Aug 2009
The supported status is what Apple officially supports - if your machine is not on Apple's list then you'll see a red cross. If you email me a screenshot of your system profiler (which contains your exact model number) then I can tell you more about your status (don't post it here as that screenshot contains your Mac's serial number).
burypromote

+86
Joris-Vervuurt had trouble on 28 Aug 2009
This is a nice tool, however at startup it says that you need Mac OS X 10.6 in order to change the boot mode... on my iMac with Mac OS X 10.5.8, I am able to change the boot mode!

In earlier versions, this wasn't possible...
[Version 1.2.2]

2 Replies

burypromote
Private (developer) replied on 28 Aug 2009
Thanks - fixed. Version 1.2.3 uploading as we speak.
burypromote
Private (developer) replied on 31 Aug 2009
P.S. Changing it even on 10.5 won't hurt but won't have any effects either.
burypromote

+48
mac adam had trouble on 28 Aug 2009
On my MacPro Quad Intel Xeon 2,93Ghz,
Kernel not boot in 64bits…
It's say 32bits kernel… :p
[Version 1.2.1]

2 Replies

burypromote
Private (developer) replied on 28 Aug 2009
Is your Mac supported?
burypromote
Private (developer) replied on 29 Aug 2009
That was fixed in version 1.2.2

funnyone_ger rated on 06 Sep 2011

[Version 1.6]



-5

Smoochict rated on 13 Apr 2011

[Version 1.6]



+12

Esekel rated on 11 Dec 2010

[Version 1.6]


Downloads:99,095
Version Downloads:65,868
Type:Utilities : System
License:Free
Date:04 Mar 2010
Platform:Intel 32 / OS X
Price:Free0.00
Overall (Version 1.x):
Features:
Ease of Use:
Value:
Stability:
Displaying 1-10 of 33
1 2 3 4 >
Displaying 1-4 of 4
Displaying 1-3 of 3
-
-
-
Please login or create a new
MacUpdate Member account
to use this feature
Watch Lists are available to
MacUpdate Desktop Members
Upgrade Now
Install with MacUpdate Desktop.
Save time moving files & cleaning
up space wasting archives.
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 questions here.

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 64-bit mode
  • it shows whether the MacOS X Kernel is running in 32-bit or in 64-bit mode
  • it shows whether Apple officially supports booting a 64-bit kernel on your Mac
  • it allows you to select whether you want to start the MacOS X Kernel in 32-bit or in 64-bit mode (the setting might be ignored on MacBooks, depending on how Apple implements the restriction)
  • accompanying webpage explains what the whole commotion about 32-bit and 64-bit in MacOS X Snow Leopard is about


Requirements:

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


To set the kernel's startup mode:
  • Intel Mac
  • Mac OS X 10.6 Snow Leopard or higher
  • Admin rights (as a system file needs changing)


- -