Most AMDs still get 1.5-2 times the battery life

https://jarrods.tech/list-of-laptop-battery-life/

MSI try it is pretty good, isn’t it? Makes it easy to see how far your RAM goes. Once you found the fastest one that is stable, you can use that as a baseline to OC further.

6000 runs in 1:1 mode (UCLK = 3000MHz)
7600 runs in 1:2 mode (UCLK = 1900MHz, slower than FCLK)

6000 CL36 is not the same as 7600 CL36 btw.
And of course you can run the 7600 CL36 kit at 6000 CL30

$280 4k 60Hz IPS 300 nits
Seems like a basic monitor. Probably overpriced. What do you want to use it for?

For gaming this is bad. 1440p 165Hz is better
For productivity I’d look for a 32" 4k monitor or 2 individual 27" 1440p monitors.
For photo editing I don’t know. Depends on how good the colors are.

7800 XT is 475 USD in Germany (540€ after VAT)

The 7900 GRE actually got 10% SLOWER memory than the 7800 XT, but more cores. 5% faster and 0-10% more efficient than the 7800 XT.
At 720€ (635 USD) it’s very overpriced.