Except that if the design is not good, the heat from the PCB components is transfered to the PCIe power connectors.
RTX 4090 bad design:
www.guru3d.com
RX 6900 XT good design:
www.guru3d.com
RTX 4090 bad design:

GeForce RTX 4090 Founders edition review (Page 9)
NVIDIA unveiled their much-anticipated Series 4000 graphics cards, beginning with the GeForce RTX 4090 founder edition. The new graphics card provides greater performance, more extensive raytracing fe...

RX 6900 XT good design:

AMD Radeon RX 6900 XT review (Page 7)
It sounds like a movie trailer; but the trilogy ends today, the 3rd iteration of AMD Big Navi gets reviewed, oh yeah the shader unlocked megalodon is going to battle the GeForce RTX 3090, whilst being...
