Soldato
really? how does the back plate affect the coil whine?!
Coil whine is doe to some power related electronics on the PCB that vibrating. Some times these are on the backplate.
Has nothing to do with the GPU or VRAM. Give it a try, you won't lose warranty if the stickers are on the retention bracket. (put the screws back after you remove the backplate as it holds the heatsink but do not overtighten it)