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ThanksYou can use CPU-z to get detailed info on your current RAM modules in its SPD tab, and then you select the module # in a dropdown list.
Speccy seems to indicate that you have 2x 2GB DDR3 1333MHz CL9-9-9-24 memory modules, and I suppose they're running at 1.5V (which it does not show either).
It may be worth while to simply upgrade to 12GB of RAM, by buying 2x 4GB DDR3 1333MHz CL9 1.5V modules.


Get yourself 2x 4MB modules of DDR3-1333
or
2x 2MB modules of DDR3-1333.
Notebook RAM...
oops