I think the surface area is nice but it is not a lot of mass. I use a lot of GPUs for computation/mining and I almost bought these for some of mine. I don't think they are that much better than a regular GPU backplate when used alone, most people were buying these mainly because they also have convenient holes for attaching fans which is what is dissipating most of the heat. So I think for an amp it is better to mount the PCB it directly to chassis (or with a cheap aluminium plate in between) with some TIM (pad or paste) in between. I think NC252MP already comes with an alu plate, does it not?Hi. I am planning on building a 6 Ch AMP (I already have 3 module nc252mp but I will probably only use 2 + something else because the nc252mp is overkill for tweeters ). Regarding thermal dissipation do you think this kind of copper plate (for GPU) could be useful or its a waste of money (30 euros each with 5mm thickness) ?