The card maybe throttling down due to heat and running slow and the lower clock seems might be why 3dmark misidentified the card. In gpuz open the sensors tab and watch the clock speeds and run 3dark in widowed mode and watch the temp and clock speeds.
Ok I ran 3dmark again, this time checking the gpuz sensors. The temperature at idle is roughly 46 degrees with
Core clock: 202.5 MHz
Memory clock: 324 MHz
Shader clock: 405 MHz
while running 3dmark, the temperature shoots up to 99 degrees, almost immediately
Core clock: 752.1 MHz
Memory Clock: 1570 MHz
Shader clock: 1504 MHz , and these don't really change throughout.
After the test, the temp would immediately drop back down to idle temp