catalyst question

[gadgets]

i have the msi x3870 x2 OC and when i look in catalyst in the graphics hardware section it says:

Graphics Card Manufacturer Powered by ATI
Graphics Chipset ATI Radeon HD 3870 X2
Device ID 950F
Vendor 1002

Subsystem ID 8030
Subsystem Vendor ID 1462

Bus Type PCI Express
Current Bus Setting PCI Express x16

BIOS Version 010.075.000.002
BIOS Part Number 113-BA0001-102
BIOS Date 2008/01/15

Memory Size 512 MB
Memory Type DDR3

Core Clock in MHz 850 MHz
Memory Clock in MHz 901 MHz

Primary Display Yes

why does this only say 512MB when it has 1Gig?

 

[gadgets]

i know it has 2 gpu's and each one has 512

but the way this reads is only one is working/registering, is what catalyst displaying correct?

 

[gadgets]

there must be somone out there who knows catalyst like the back of their hand!?!

 

[gadgets]

cheers