They each render x part of the frame usually. Then have to share the information about that frame. I have a feeling they dont sync right and the frames gets "shared" uneven to try and keep up pace with high FPS when one card is behind. GFX cards and drivers today is a huge mess. Its also quite a joke when we need "optimized" drivers for x game. Since by standard definitions you would have baseline DirectX drivers and all would work perfectly. All these hacks and cheats have a backside of the medal.
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