Comment by lokedhs

I don't even have a napkin to write on so this will be the most back of the hand of calculations.

One floating point calculation for a human would probably take on the order of 2 minutes. That's 1/120 FLOP. Let's round it to 1/100. It's not like we're accurate here.

Let's say a GPU is 1 TFLOP. That means the GPU is 100 trillion times faster than a human. With 10 billion humans on earth (again, let's just round these numbers), that makes the GPU 10000 times faster than the combined power of all humans.

I don't think computational requirements scale linearly with resolution, but let's just assume it does. Your regular 1080p screen has roughly 100 times the pixels compared to your 160×120 screen. 10000/100 = 100, which means that the framerate of your manually computed game will be 1/100 of the performance of a regular GPU playing in 1080p.

I welcome someone else to make the same calculation. It'll be interesting to learn if I'm close to a reasonable answer.