[rxsevenpimp]

hi im running 4gb of ram and quad 2.2 phenom processors along with dual geforce 8800 640 meg cards. now i was wondering how i know if both cards are working with each other to produce 1300 mb of graphics memory.

[Gulo Luseus]

You wont double up on the mem, afraid it doesnt work that way. If you run in SLI mode, you have 2 cards working together with 640 each, if you run in non sli mode you get 2 cards working separately with 640 each.

[rxsevenpimp]

how do i change between the 2

[Gulo Luseus]

SLI mode you mean? If you go through Nvidia control panel, its in there. But you wont get a doubled memory whichever way you go, it will still only be 640.