whats the limitations of maxing chipsets with graphics cards. i know nforce should go with nvidia and radeon should go with ati. but can u mix thoese up. I saw zipzoomfly advertising a intel core 2 duo 975x board with a nvidia gpu. I thought that was Ati or are teh inetl chip sets universal? or any chipsets universal? I think sli and cross fire has needs speific mothboards?

Im just confused and could some one else explain or point me in teh right direction.