Anyone have the Dual Cards: nVidia GeForce GTX280 provided by Dell with their XPS730 H2C?

I would like to know the amount of memory with each of the Dell provided GTX280 cards.  I have received conflicting reports from Dell sales; one report saying 512MB per card and another saying 1GB per card.

In summary...the Dell provided Dual GTX280 cards, would I have 1GB total memory or 2GB total memory for the two cards?

Also...does anyone have the memory CAS latency (measured by Everest or some other program) for the Corsair Dominator DDR3 SDRAM 1333MHz OC'd to 1600 MHz that Dell provides with the XPS730 H2C?

Many thanks!