I had two GPU’s in which Speccy never reported the correct memory size. The first was my EVGA RTX-2070 Super and now my new ASUS RTX 3060 v2 OC. What gives and when is this going to be fixed? 
Speccy has not been updated for years and so struggles with newer tech.
Updates have been variously been promissed but TBH nobody is holding their breath.