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#11
If you do install additional RAM first, do your self a favour and test It prior to installing x64.
RAM - Test with Memtest86+
The reason I recommend this, is that should the RAM be defective, you will know straight away. Otherwise, if the RAM is bad/defective, you might encounter BSODS which will leave you wondering whether its the RAM or the x64 OS drivers. It could save you a lot of time and frustration in the long run.
Regards,
Golden