I have 6G of RAM and enable "pae" as it says in the link

http://www.backtrack-linux.org/wiki/...php/PAE_kernel

also check

joss >> root @: ~ # cat / boot/config-3.2.6 | grep HighMem
# CONFIG_NOHIGHMEM is not set
CONFIG_HIGHMEM4G = y
# CONFIG_HIGHMEM64G is not set
CONFIG_HIGHMEM = y
# CONFIG_DEBUG_HIGHMEM is not set

but verify 'bt' just keep using only 4G RAM

joss >> root @: ~ # cat / proc / meminfo | grep MemTotal
MemTotal: 3611672 kB

in backbox 3 could enable "pae" and all good
the 6G are in use

details:
s.o.: backtrack5 r3 x86, backbox3 x86(pae enable), windows8 x64
ram: 6G
hd: 500G
Processor: AMD-E450 dual core 1.65 (apu)
video: radon hd 6320

there are any .deb to enable "pae"?
which can be the error?

thanks