Renato Oliveira <renato.oliveira@grant.co.uk> writes:
> If I use postgres 32 bit will it benefit from the extra memory on the system?
Yes, although perhaps not as much as you'd get with a 64-bit build.
You still get the ability to have more than 4GB worth of kernel-managed
disk cache, and in many situations that's all the value of a 64-bit
machine anyway. You can find lots and lots about that in the
pgsql-performance archives.
regards, tom lane