Paul Morgan-Roach wrote:
AFAIK you need to use a 64 bit OS / CPU to use more than 4Gb RAM

Only with Windows, and that's a licensing rather than technical restriction.

'plain' 32bit x86 can address 4GB of memory.

32bit x86 with PAE (which is about the last ten years' worth) can address 64GB of memory (with OS support for PAE).

Ubuntu ships with PAE support (as do most distros - the kernel's supported it for ever, too), so any 32bit Ubuntu install will be able to address 64GB by default.

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Avi

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