Graphics card question on power connector and sagging

[Invicta]

I am looking at a new PC build with an ASUS NVIDIA GeForce RTX 4080 16GB TUF graphics card and ASUS Intel Z790 ProArt Creator motherboard. It is a few years since my last build so this large card is concerning me for two reasons:

1) The weight on the PCIe slot. I see overclockers sell a Lian Li GB-002 Anti Sag Bracket for VGA Cards. Does this fit any ATX motherboard as I am not sure what it is screwing on to from the diagram.

https://www.overclockers.co.uk/lian-li-gb-002-anti-sag-bracket-for-vga-cards-black-ca-79l-ll.html

2) Power supply cable, the ASUS web page states the card has a 16 pin connector, this is new to me do I need a power supply with a 12VHPWR cable? E.g as supplied with this Seasonic power supply

https://seasonic.com/prime-tx

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[Tetras]

2) Power supply cable, the ASUS web page states the card has a 16 pin connector, this is new to me do I need a power supply with a 12VHPWR cable? E.g as supplied with this Seasonic power supply

If you have an old PSU without a 12/16 pin then you don't need one, they bundle an adapter with the card (works with 8 pin PCI-E connectors). Most newer [modular] PSUs from up to around 5 years old, you can buy (or request) a cable that plugs directly into your PSU, rather than making a big mess of (8 pins + adapter) cables in your case.

Usually manufacturers label a PSU with a native 12/16 pin as PCIE5, but some PSUs included the cable when it was only an nvidia standard and don't have this label. ATX 3.0 PSUs are supposed to be safer for powering the cards (cos they can cope with the massive spikes by design), but it isn't required.

The biggest danger with large, heavy graphics cards is moving the PC (like between houses).