spristupni na vsetkych OS okrem MS OS.

Intel versions of Mac OS X support PAE. The Linux kernel supports PAE as a build option and most major distributions provide a PAE kernel either as the default or as an option (Red Hat Enterprise Linux 6+ kernels expect PAE). FreeBSD and NetBSD also support PAE as a kernel build option.

Microsoft Windows implements PAE if booted with the appropriate option, but current 32-bit desktop editions enforce the physical address space within 4GB even in PAE mode.

P.S. predpoklad vyuzitia celej RAM (okrem pouzitia normalneho OS) je remapping posledneho GB RAM nad 4GB aby sa neprekryval s PCI address space. Vie to vacsina chipsetov akurat v BIOSe to moc casto neni, cinan na to kycha.
P.S.2. ked neveris tak napr. http://www.cyberciti.biz/faq/ubuntu-linux-4gb-ram- limitation-solution/
Sme zas u toho jak MS uspesne presvedcil cely svet ze ich neschopnost je "realita". MS marketing by mal dostat zlatu medailu. Bohuzial. (az MS skrachuje tak sa ich marketingove oddeleneie urcite uspesne uplatni ako predavaci hrncov za 50tisic na autobusovych zajazdoch. Maju v tom uz prax )