does 4+2=4 or 2? when it comes to vram?

oxiide

Distinguished


Wait, in replacement of? Or in addition to?

If you're adding a 4 GB card to pair with a 2 GB card in Crossfire, the lower of the two sets the limit for both cards: 2 GB.

If you're replacing a single 2 GB card with a single 4 GB card, then yes of course the 4 GB is usable (though it rarely will be used).