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For gaming (which these cards are sold and marketed to), it doesn't make a difference today.

It depends on the games you play. I often run out when playing VR games, so I have to reduce resolution. Even with an 8gb card.

How do you know that's a memory issue? I'd expect that to be less of a concern in VR games and more a requirement to render the exact same duplicate resources at slightly different perspectives, which should not be memory, but pure GPU throughput.

No, it is - in terms of gaming performance, the thing that the 3070 is primarily made for, it's much much faster than the 1080 despite having the same amount of RAM. It's probably also much faster in Machine Learning activities as well.

>The size of a car's gas tank has no effect on performance

It has a dramatic effect on performance when you run out of gas -- a little bit like the brick wall you hit if you run out of memory. The GP'S analogy isn't very accurate, but it's not totally wrong

I guess the analogy works if you could start ripping out random components from the car and put them in your gas tank and burn them as gas