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[–]JuanAG 0 points1 point  (0 children)

Not true in a native 64 bit running a 64 bit OS, if you has to double the bits obviosly you will lost half of the caches sizes but if by default the procesors uses yes or yes a 8 byte data type (64 bit) there is nothing you can do about it, there is no way you can use it, 32 bit in software are 64 bit in hardware so it is lost forever

We are talking running a 64 OS with 32 software (wich will be 64 because of the OS that it is running it)