Why bother looking for hacks that require paging in the OS? It's certainly possible that a 32-bit OS can access more than 32-bit's worth of RAM (4 GB) via paging, but there is definitely a performance hit in doing so.
If you already have a 64-bit processor, then I see no reason to punish yourself with a 32-bit OS.
To be clear, 32-bits represents 2 to 32nd power, 232
, number of uniquely mappable addresses, which is 4294967296, better known as 4 giga[bytes]. Each address, in a modern processor, is a single byte, which is why the number of addresses equals the number of bytes. As pointed out by others, there are processor extensions that can enable further memory mapping, but similar to that being done for 16-bit processors, it was done as a stop-gap for those unable to get 64-bit processors.
Besides, most consumer motherboards do not support more than 4 GB of RAM for 32-bit processors. And if you are going to buy a new motherboard, then you should definitely buy a 64-bit processor.
dont know 32 bit is just generally more reliable and fast, did see some benchmarks to that effect..
This is unlikely considering that 64-bit processors have wider registers (64-bits) to push more data through the pipes. It should be the same or better.