Question about video ram on graphics card. Misread?

[blackbird307]

Dxdiag and a bunch of other things say I have 2.7 or 2.8gb of on board video ram. This can't be right because when I bought thinking it would be just 1gb. Is this some attribute of gddr5 or is it something different?

EDIT: Just found out directx devotes memory to pool.

[SummerDays]

It should show you in the ATI information screen, under graphics hardware, if it's using extra memory as well.

When I had the 4870 with 512 mb in this computer and even crossfired with the 1 GB card, it would show extra ram as well, but with two 1 GB crossfired 4890s it no longer uses it.