Is my MBP 64 bit?

[brentg33]

Just curious, i have an older MBP w/ 2.16 core 2 duo processor. i was my understanding that all c2d mbp's were 64. just wanted to make sure

thanks

 

[ceezy3000]

yes it is 64 bit. You pretty much answered your own question in your own post.

 

[brentg33]

Just wanted to make sure because I had read different things on other sites

 

[Chupa Chupa]

Just wanted to make sure because I had read different things on other sites

Maybe they were confusing the C2D with the original CD which is 32-bit.

 

[iAlexG]

I didn't think Leopard was 64-bit? can you explain please (i'm new)

 

[goMac]

There were some 2.16 ghz Core 1 Duo Macbook Pros, maybe that's why the OP was confused?

If you have Firewire 800, you have a 64 bit machine, that's the quick way to tell on the 15" Macbook Pro.

 

[Sehnsucht]

I didn't think Leopard was 64-bit? can you explain please (i'm new)

Leopard is 32-bit with 64-bit memory extensions. Ordinarily 32-bit OS's like Windows XP (not including XP Pro of course) can only address ~3.5 GB of RAM. Leopard can recognize up to 32 GB (I think) hence that amount in the Mac Pro.

A 32-bit OS can run on 64-bit processors, but not vice-versa.

 

[kryptonianjorel]

Leopard is 32-bit with 64-bit memory extensions. Ordinarily 32-bit OS's like Windows XP (not including XP Pro of course) can only address ~3.5 GB of RAM. Leopard can recognize up to 32 GB (I think) hence that amount in the Mac Pro.

False. 32 bit Windows can read up to 4 GB of RAM, but the way it handles the RAM is different, and thus not all of it can be accessed by applications under Windows. Windows XP Pro is not special. 64 bit OSes can address 16.8 Exabytes (EB). Since it took nearly 40 years to max out the available memory addresses in 32 bit OSes, i assume it'll take another 40 to do it again.

 

[iAlexG]

Ok thanks

 

[airplaneman]

There were some 2.16 ghz Core 1 Duo Macbook Pros, maybe that's why the OP was confused?

If you have Firewire 800, you have a 64 bit machine, that's the quick way to tell on the 15" Macbook Pro.

never heard of core 1 duo. are you talking about core solo?

 

[kryptonianjorel]

never heard of core 1 duo. are you talking about core solo?

I think he means the original Core architecture, as opposed to Core 2. There was a Core Duo line and a Core Solo line (which were Core Duos with a disabled core)

 

[spaceboots06]

Yeah, 64 bit...

 

[goMac]

I think he means the original Core architecture, as opposed to Core 2. There was a Core Duo line and a Core Solo line (which were Core Duos with a disabled core)

Yep. They just called them Core Duos, but it's an important enough distinction that I throw the 1 in.

 

[Sehnsucht]

False. 32 bit Windows can read up to 4 GB of RAM, but the way it handles the RAM is different, and thus not all of it can be accessed by applications under Windows. Windows XP Pro is not special. 64 bit OSes can address 16.8 Exabytes (EB). Since it took nearly 40 years to max out the available memory addresses in 32 bit OSes, i assume it'll take another 40 to do it again.

I was under the impression that Windows XP Pro *is* the 64-bit version.

And is "~3.5 GB" really that much different than "4 GB"?

I am aware of how Windows allocates memory to applications, I just wasn't sure exactly how much memory 64-bit OSes can address.

 

[getz76]

I was under the impression that Windows XP Pro *is* the 64-bit version.

Windows XP Professional 64-bit is a 64-bit operating system.

Windows XP Professional 32-bit is a 32-bit operating system.

 

[lazydesi]

all the core 2 duo are 64bit machines

all core duo are 32 bit machines

 

[Sehnsucht]

Windows XP Professional 64-bit is a 64-bit operating system.

Windows XP Professional 32-bit is a 32-bit operating system.

*Nods* kthnx.