Comments on: PAE vs 64 bit – What manufacturers don’t want you to know

By: Yuhong Bao

Yuhong Bao — Sun, 03 Jan 2010 01:21:27 +0000

“In a few years, systems will already be exceeding 64 GiB of memory”
Actually, PAE support as much physical address space as long mode does.
On Windows’s licensing limits, here is an article by Geoff Chappell:
http://geoffchappell.com/viewer.htm?doc=notes/windows/license/memory.htm

By: Ted

Ted — Sat, 26 Sep 2009 00:44:33 +0000

@ gawdfadda

But yea DEP also uses 36bit and its a kernel hog too isnt it?
and that’s enabled by default, but PAE ins’t so what up with that then..

By: Pacoup

Pacoup — Thu, 24 Sep 2009 01:26:09 +0000

Well, I have to admit it was just for the sake of the title -_-… I don’t really think PAE is really a solution either. If anything it’s just a temporary gimmick.

Still, it’s part of this world, as Apple still is running Snow Leopard in 32 bit on the kernel level as of 10.6.1 you know. Anyway, most of the time I haven’t actually been able to make it work well and I’d just recommend to anyone to simply get 64 bit and get over with 32 bit and Windows XP now that Windows 7 is coming out.

By: gawdfadda

gawdfadda — Wed, 23 Sep 2009 21:45:45 +0000

I find this hard to swallow as anyone who understands the memory management model will realize that PAE also hobbles your system in a 32-bit world. It cuts your Free Page Table entries down to about 10% and the pools drop to half of what they originally were set. This in turn, causes performance issue at the kernel level. Microsoft did not necessarily try to hide this. They simply do not want this level of information going out to those who would implement without a good understanding. As far as Apple goes, Mac is a home user system at this point, or for graphics, and really cannot be discussed in this venue as it does not, nor will it ever, apply. Apple can stick to blowing up Ipods, lolol.

By: Pacoup

Pacoup — Wed, 09 Sep 2009 22:56:02 +0000

I’ll have to do research on this, thanks.
(For perplexed readers, he’s talking about the Intel Core 1, not the Core 2, which are all 64 bit capable)

Other note I’ll have to check on, actual OS X, even Snow Leopard (until an update comes out for that) still run their kernel in 32 bit mode. Wondering how Apple managed to make things 64 bit without breaking anything? The answer: they never did.

By: Chris

Chris — Fri, 04 Sep 2009 04:41:22 +0000

Note that first gen Intel Macs use 32 bit Core Duo processors

By: Pacoup

Pacoup — Mon, 06 Jul 2009 15:04:41 +0000

Here you go, I added the information which states that you don’t have to do anything for that in OS X. As long as your hardware supports it, your Mac OS X supports it.

By: Evil

Evil — Fri, 03 Jul 2009 19:36:00 +0000

Nice.. ok for Winows but.. you forgot the ‘how to’ for Mac Osx!