According to Microsoft's website, the "i7 upgrade" gets you "UHD graphics". I assume this is falsehood? As all should have HD620 graphics correct? Any way to check detailed specs comparison side by side? I don't see any on microsoft's website. Second: I just sold my SP3 and am thinking about picking up a SP6. Any idea if this will work in a SP3 dock with maybe a fudged thickness adapter?