I run at 1920*1080 usually with AA on between 4-12 samples depending. before the HD pack I was using 989MB of VRAM with those settings. After installing the HD pack it jumped to over 1900MB used, which I don't have.
It is beautiful, but unfortunately, even with $320 worth of video cards and a system specced well above the recommended values, The performance is just too poor to leave it installed.
really a shame.
**EDIT**
Disabling crossfire resolved the vram issue, not sure how to explain that as far as I know this is just a texture pack, don't see how textures would interact with CF to cause that, but there you have it.

