It really doesn't matter until you get to a more specific question. Why are you asking about this? I hope this general overview helps your understanding of what people really mean when they are discussing their bits.
Boost Your Old Mac's Performance
In a terminal window type uname -m. Go to the Apple Menu and select "About this Mac". Mac OS X is fairly bitness-agnostic, so either should work. If still in doubt, use the bit version. Then look at the column Kind. If it says Intel , then you are currently running 32bit mode. If it says Intel bit , then as the text says, you are running 64 bit mode.
Note: You must show All processes , from te dropdown next to the search box filter. Then you can check Nate Bird 's answer on what processor you have and the supported modes for it. Many OS X programs come in universal binary format, meaning that they have multiple versions some combination of PowerPC bit, PowerPC bit, Intel bit, and Intel bit included in the same file.
Eclipse apparently doesn't come this way, so you have to decide which version to download. I'm not familiar enough with it to know if it has to run in the same mode as what you're trying to debug; if so, run your program, and look for it in Activity Monitor to see what mode it's running in. If Eclipse doesn't have to be in the same mode or the Java code just runs inside Eclipse , then you can use either one unless you're on a bit-only CPU, i.
Core Solo or Core Duo. As already stated by Gordon Davisson, fat binaries may include both bit and bit executables of a program see also Multiple Architecture, Single Build. Run uname -a in the shell to show details about the kernel. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.
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Farewell, Core Duo: bit in Lion - Back to the Mac: OS X Lion Review
The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How to check whether my Intel-based Mac is bit or bit Ask Question. Asked 8 years, 3 months ago. Active 4 months ago. Viewed k times. How can I tell the 32 or 64 bit capabilities of my Mac? What version of the OS are you running?
When was your MacBook Pro built? It's quite simple. Go to the Apple logo and select "About this Mac.
If it says Core 2 Duo, then it is 64bit ignore the 32bit kernel issue, it will run 64bit software just fine. Physically, if your MBP has a black keyboard, it is absolutely 64bit.
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The original MBPs had a silver keyboard and the 32bit units were all but replaced in early So if you purchased your model even in the later course of , then it is a Mac capable of running 64bit. Also, if you are running Lion, then you are 64bit as Lion does not run on 32bit Macs. Paul Lefebvre Paul Lefebvre 2 2 silver badges 5 5 bronze badges.
System Profiler isn't installed on my machine—or Spotlight can't find it—so this answer won't work for everyone. What is your machine and OS? The name was changed to "System Information" a while ago it's in Utilities folder. I did find the System Information app. It would be good to update the answer for the benefit of others. Unfortunately, I couldn't find the "bit Kernel and Extensions" item in the Software section of the System Information app. I'm on v If you are using I have Mac OS X Cristian Ciupitu 4 4 bronze badges.
Greg Cain Greg Cain 2, 1 1 gold badge 14 14 silver badges 12 12 bronze badges. This is the best answer in my opinion. Basically if you have anything newer than an MacBook you have a 64 bit processor and OS… Here is the cheat table. Nate Bird Nate Bird 1, 13 13 silver badges 22 22 bronze badges.
This does't tell the full story but it's a start. That is true. The system will continue run in this mode until the system is rebooted, reverting back to bit kernel. Inversely, holding down the "6" and "4" keys upon bootup will force the bit kernel to load. Mac Kernel Toggle. Media Composer 5.
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