3 GB est égal à 3 GO.

3GB = three gigabytes full of zeros and also full of bytes.

If it's 3 GigaBYTES it equals 3 Go (bytes = literal translation of octets in English). If it's 3 Gigabits it equals 8 times less (I'll let you calculate that ^^)

When the B is uppercase, it corresponds to bytes. When the b is lowercase, it corresponds to bits, with the conversion 8 bits = 1 byte.

So in this case, they are equivalent.
"He siiiiigns with the tip of his swooooord, with a W that means WORROOOOOO!!!!"