And what is the matter with the 5080 is said to be burning
I haven't heard anything specific about the 5080, but since the 4000 cards nvidia have almost exclusively used the 12/16 pin connector on their cards, known as 12VHPWR or updated version: 12V-2x6.
Nvidia claim that there's nothing wrong with this connector and we're just dummies that plug it in wrong, but the consensus (including the opinion of the more learned among us, like buildzoid) is that this connector is just bad (primarily the lack of safety margin) and is always going to be prone to problems until it is ditched entirely.
That said, 99% of the reports are for high-end cards, so it is probably alright at lower wattages, where the safety margin is less of an issue.
The 3000 cards used a different design where the pins were load balanced which mitigated the worst characteristics of this connector, but for reasons unknown nvidia stopped doing this on later cards.
Example videos from two YouTubers who have covered it:
Some AIB models have mitigations in place (like the Astral).
If you want to avoid the connector, most (not all!) 9070/9070 XT cards don't use it and almost all of nvidia's 4070 non-Super do not use it.
I'm looking for advice about not overpaying for the products but have enough quality products under the 5080 graphics card.
What you have is fine. You could save money on the motherboard and go for X870 or B850, but I don't know what features you want/need.
