You obviously don't know what you are talking about my friend. If the card games and runs properly don't worry.
The proper clock (shown in MSI afterburner) is 1000Mhz
The Clock shown at the specification is 2000Mhz, because it's a DDR
But because this is GDDR5 They say the 'effective clock' is 4000Mhz
Hope this clears down the confusion