How much RAM is 8Gb

I bought a T440s with 8Gb RAM which I understand is 4Gb soldered in and a 4Gb card.
But when I look in windows and linux it says it has:
8054220 Kb = 7865.44922 Mb
Whats going on here?
http://thinkpadmint.blogspot.co.uk/

which software are you using to look at the ram?
@mithunr, what you are saying is only true for hdd/ssd, not for RAM. The RAM is still calculated using binary system, not using the decimal system. 
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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