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[[HomePage]] > [[ComponentHowTo Components and HowTos]] > [[Storage Memory and Storage]]

==== PAE (Physical Address Extention) ====
~Physical Address Extension (PAE) is a feature to allow (32-bit) [[x86]] processors to access a physical address space larger than 4 gigabytes. This includes RAM {Random Access Memory} and memory mapped devices.
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~Sometimes referred to as PAE-Highmem.

==When to use a PAE version of Puppy==
~If the (32-bit) computer has-
~~-more than 4GB RAM, then the PAE version is required to be able to access the whole memory.
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~~-4GB or less RAM, then using the PAE version may be still possible/desirable. This is because of the No Excute feature (see below). Note, however, there may be a performance penalty using PAE (see Related Webpages).

==Puppy Version==
~There are versions of Puppy Linux that have a PAE version available, including [[Puppy53 Slacko]] and [[PrecisePuppy]].

==No Excute==
~PAE is not only more physical address space but also important for the "no execute" feature which disables execution of code that is marked as non-executable.

==Compatibility==
~PCs MUST have PAE to boot a PAE distro. PAE is built into the system's CPU. Non PAE compatible processors include some of the Intel Atom range.
~Not all applications are compatible with PAE.

==Compiling the Kernel==
~For advance users compiling there own kernel configuration. There can be chosen one of these three SYMBOLS (kernel 3.4.9S)
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~Symbol: NOHIGHMEM
~If you are compiling a kernel which will never run on a machine with more than 1 Gigabyte total physical RAM, answer "off" here (default choice and suitable for most users). Very Happy
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~Symbol: HIGHMEM4G
~Select this if you have a 32-bit processor and between 1 and 4 gigabytes of physical RAM.
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~Symbol: HIGHMEM64G
~Select this if you have a 32-bit processor and more than 4 gigabytes of physical RAM.

==Related Webpages==
~[[http://murga-linux.com/puppy/viewtopic.php?t=84472 Slacko 5.4 PAE vs NON-PAE comparative Analysis by Q5sys]]
~[[http://murga-linux.com/puppy/viewtopic.php?t=84816 Slacko 5.5 - Comparing PAE vs 4G by gcmartin]]
~[[http://murga-linux.com/puppy/viewtopic.php?t=67707 Have more than 3GB of RAM? PAE discussion]]
~[[http://bkhome.org/blog2/?viewDetailed=00142 Barry's Blog post - See comment]] by [[scsijon]]
~[[WikiPedia:Physical_Address_Extension]]

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==Categories==
CategoryTutorial
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