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I'm sure this has been answered (4GB to 8GB memory)
- Thread starter Antidoll
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what machine do you own. model number please? here is a link to a lot of install videos
http://eshop.macsales.com/installvideos/
if you let use know what you have I can be more helpful.
R.I.P. STEVE
http://eshop.macsales.com/installvideos/
if you let use know what you have I can be more helpful.
R.I.P. STEVE 
Are you talking about the Mac Pro or the MacBook Pro?
If it is the latter:
If it is the former, you can have a look into the User Guide on page 43, the one that should have come with your Mac. If not: http://manuals.info.apple.com/en_US/mac_pro_mid2010_ug.pdf
If it is the latter:
If it is the former, you can have a look into the User Guide on page 43, the one that should have come with your Mac. If not: http://manuals.info.apple.com/en_US/mac_pro_mid2010_ug.pdf