It shows the overall readings, though, not how much power each wire is consuming ... so you could use it with the newer GPU, but it is best not for now. Cable maker Moddiy is warning against ...

The power cable for an Nvidia GeForce RTX 5090 Founders Edition graphics card has been shown reaching a scorching temperature of 150°C in thermal tests, prompting concern that the days of melting ...

That is WAY past the spec for that wire, and indicates an extreme degree of current imbalance in the connector. How is that possible? Doesn't the GPU have load-balancing circuitry? Well ...