Card memory issue?

[slipd]

Hi guys,

Any idea why I'm getting mixed reports from catalyst and gpuz?

Catalyst say that the card has 1919mb whereas gpuz says 512mb... I know which one is right but I wondered why they weren't both displaying the right figure

 

[slipd]

Catalyst says that the card has Hypermemory so I'm guessing the card has 512MB physical memory and accesses another 1.5GB system memory? in which case they're both right?

Would that mean its using the system's physical ram? Its got 4gb but its only Windows 7 x32 so only 3.25gb is being used according to system information.