system
A chat on subreddit /r/pcmasterrace
human
It's quite hard because they use the same memory (I think from just one card) and have to sync and render alternating frames
gpt
Not that only one cards memory was used, but that both GPUs had to fill their memory with identical data because they were working on the same tasks just alternating frames. So you ended up with double the theoretical performance but only the same amount of VRAM