c8g passmark score: 1853 c8i passmark score: 3008
I guess the fps column isn't a good representation of single thread score. Also looking at the passmark scores for i4i vs i4g, i4g is about 1k and intel is about 2k, and the more modern Graviton equivalent of i4 is the same price, so...
https://go.runs-on.com/instances/ec2/c8g
https://go.runs-on.com/instances/ec2/c8i
https://go.runs-on.com/instances/ec2/i4g
https://go.runs-on.com/instances/ec2/i4i
Silly amazon.