The point is that Nvidia didn't increase number of CUs (SMs) with the 3080/3070. The 3080 has 68 SMs, just like the 2080 Ti. It just has double the number of FP32 ALUs per SM. So you really can't use TFLOPS to compare the two architectures, because the ratio of compute (FP32) to texture rate/fill rate/integer rate, is different.of course CU's doesn't scale performance linearly but still improves it specially with higher resolutions more pixels requires more parallelisation same with bandwith, so i guess that's the reason 3070 Ti is only 5% faster then 3070 at 1440p because 3070 doesn't lack BW but have enough of it.
i was comparing 3090 with 6900XT at 4K res btw.