Kylearan
Keep in mind that you need a hell of a lot more than 8g to do a single 3090. I'm not even sure if a 50g syringe of TG 10 w/mk thermal putty can do a full 3090 on both sides.
No... This isn't meant for the entire card, so you wouldn't want to do whatever it is you are attempting to say here. This only goes on one component and THAT IS IT. Not on the VRM, Not on the VRAM, front of back, and Not on the core. This only goes on the back of the inductors, nothing else.