Re: OT: Which MacBook Pro to buy
Re: OT: Which MacBook Pro to buy
- Subject: Re: OT: Which MacBook Pro to buy
- From: Clark Cox <email@hidden>
- Date: Sun, 18 Jan 2009 09:56:30 -0800
On Sun, Jan 18, 2009 at 7:21 AM, Chris Jones
<email@hidden> wrote:
>> Hi,
>
>>
>> Not really answering, but it's my understanding that the limitation to 4GB
>> is not really a hardware one for the 15". I've even heard of 6GB upgrade
>> currently available and demonstrated... I might be wrong though.
>
> Yes, I've read the same reports and would tend to agree and likely a
> software constraint. What matters is the kernel and in OSX 10.5 this is
> still 32bit.
The kernel can already access more than 4 GB of memory and has been
able to for a while (the PowerMac G5 supported up to 8 GB years ago,
and the current MacPros support up to 32 GB).
> This normally limits memory to around 4G which is what you are
> seeing. For the 17in macbook pro (and other mac pros) to support more, then
> are presumably running some sort of LBA kernel, which performs various
> tricks to allow more ram to be accessed by the OS (although a single process
> is still limited) ?
> I've also read that 10.6, when it comes out will switch to a 64bit kernel,
> where possible, which will naturally allow all 64 bit capable machines to
> access a lot more than 4G out-the-box. At this point my guess is the 4G
> limit might be lifted on current 15in macbook pro machines, but this is pure
> speculation.
>
> I would say, if you can wait until 10.6 comes out and see what that
> brings...
>
> Chris
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--
Clark S. Cox III
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