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x32 is not "slightly slower" actually it "slightly faster" however it has 3.xGB ram capacity limitation.
As for Microsoft ... the x64 is actually easy to make the problem is that to be able to install them on x64 system you need to certify them with MS meaning go through lengthily process and pay money to MS as well, that's the reason some companies prefer not to release x64 drivers especially for older hardware.
But here we talking about Sony and not so old hardware.
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