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32- or 64-bit Kernel Startup Mode Selector
32- or 64-bit Kernel Startup Mode Selector 1.6
Your rating: Now say why...

(11) 3.4545454545454546

Check your system & set the kernel startup mode.   Free
Add to my Watch List
Email me when discounted
  • Download Now
    2.2 MB
  • Visit Developer's Site
    Markus Winter
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
Intel, 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)









  • SixtyFourSwitc...
    +7
    Free
    Preference pane that toggles ...

  • Temperature Mo...
    +1
    Free
    Displays processor temperature.
32- or 64-bit Kern... User Discussion (Write a Review)
ver. 1.x:
(11)
Your rating: Now say why...
Overall:
(11)

sort: smiles | time
burypromote
-2

-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
-10

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
+6
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
+2

+2
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

+69
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

+7
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
-13

-11
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
+12
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
+2

-11
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
+3

+12
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

+34

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

+34
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
+1

+4

joemikeb reviewed on 09 Sep 2009
Works as advertised on my 3.06GHz iMac Core 2 Duo. My only quibble is just that a quibble. It would be nice if this were a preference pane which is the only reason I did not rate it as a 5 overall.
[Version 1.3.3]


burypromote
+7
Private (developer) commented on 09 Sep 2009
First off I wrote a little program. Nothing special but useful. Have done it before (Transform, Safari 4 Modifier) and put it out as donationware. Not that I got many.

So I think I might as well give 50% of the donations to my mothers charity. Might even result in a rise in donations. Win-win either way.

Works indeed - except that some people donate a LOT (1x $250, 1x $100, 6x $50) and it just doesn't feel right to keep 50% of that. So I decide to give everything to the relief project.

I have a website which should answer all questions about the program, and even has my home address and landline phone number. The relief project has my mother's address and landline phone number. So we are easily traced. The address of the banks and the acoount details are on there. So people can contact me, my mother, the bank if they have any doubts about the project. I put my name and reputation behind it.

And I'm getting a bit sick of people who do not read the information provided, who do not do any background checks, but think it is ok to insinuate wrongdoing on my part.

And to the ones who complain about me asking for donations - I wonder how many of you actually have donated. I have a feeling I know the answer.

Dr. Markus Winter
Im Fasanenwäldchen 4
69126 Heidelberg
Tel: +0049 (0)6221 187 0869
[Version 1.3.3]


burypromote

+5

willYa reviewed on 07 Sep 2009
Works perfectly on my Macbook Pro. My only suggestion is to make this a System Preference pane.
[Version 1.3]


burypromote
+3

+11
design-Q commented on 06 Sep 2009
Sorry, can't help but to comment. Pity to the developer from all the abuses but his attitude does not help at all. All the info should be in this page since people get to know this appl. from this site mostly and did not came across directly from his accompanying website.

That aside, this app does work i.e. it sticks as oppose to the the start up shortcut 'cmd 6 4' which you have to do it each time (at this point of SL release, better this way IMHO since not many appl. take advantage of SL already).

All this depends on yr Intel Mac however i.e. pre-2007 (or something) does not work due to the HW. All being said, reading all the comments below re. users comments and developer cry about the goodwill donation to charity really give bad lights to the release here. If it is for charity, leave it to the people to decide, not pressing them with all the comments about number of visitors/downloads vs total donations received. WTF.

For those who prefer using terminal there's an easy solution at the foot of the comments (comment #1) or for start up shortcut, comment #4. Chill!
[Version 1.3]

5 Replies

burypromote

+11
design-Q replied on 06 Sep 2009
further info:

'... If you're wondering whether your Mac has a 64-bit EFI firmware, you can type the command “ioreg -l -p IODeviceTree | grep firmware-abi” into the Terminal. The response will identify the machine as either having 32-bit or 64-bit EFI.' Quote from
burypromote
+1
Private (developer) replied on 06 Sep 2009
Sorry, but if people are too lazy to read the website but feel the need to voice their wrong opinion about things which are explained on said website ... then that's just too much to bear.

I'm not a saint, and after about 70 emails asking things which have been explained on the website (which I answered politely as people ask me directly) I also have to deal with people who think it is in any way or form proper to mouth off here showing their ignorance - well, that's where my patience grows a bit thin. And I think justifiably so.
burypromote
+2
Private (developer) replied on 06 Sep 2009
P.S. And if it bothers you so much that I keep asking for donations - if it feeds just one more kid for one more day, then your bother doesn't bother me at all ;-P
burypromote
-1

+73
livings124 replied on 07 Sep 2009
The way you are badgering for and listing donations here is a bit tacky, but my bigger question is why don't you link to the charity site so people can donate directly. Why are you acting as a middle man like this?
burypromote
Private (developer) replied on 09 Sep 2009
@ LIVINGS124

If you had bothered to actually follow the link to the relief project then you would have found the bank information there for both the german and indian account

http://www.veronikawinter.de/Indien/English/Donations/Donations.html

Some people probably donate directly, others donate via PayPal - either way is much appreciated.
burypromote
+1

+11
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

+11
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

+11
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

+58
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

+49
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]



+5

Eskel rated on 11 Dec 2010

[Version 1.6]


Downloads:70,124
Version Downloads:36,897
Type:Utilities : System
License:Free
Date:04 Mar 2010
Platform:Intel
Price:Free0.00
Overall (Version 1.x):
Features:
Ease of Use:
Value:
Stability:
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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 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)
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