Lately, i've noticed that I'm reaching pretty high temperatures on GPU. Assuming I've got an open build/test bench could I Just have my morning coffee rest on top of it? of course without too much weight pulling down or ripping out the card. Or is there some secret chemical that could leak and give me some sort of cancer? I'm sorta new to this whole PC on Reddit thing so not quite sure if this is the right sub but figured I'd try my luck.

sure can m8,
you can cook bacon on it as well

Is it your 480?

Those kind of temps should be coming from a 290X lmao

Usually I take off my CPU waterblock
Make a paper cup
Pour coffee into it from mug
Place full paper cup on cpu
100c on cpu really heats it up quick

Thermal paste on the bottom of the cup to transfer it into coffee more efficiently.

nah, i like the burnt taste from the paper cup going into the coffee
really gives it that unique flavor.

Use I C Diamond for creamer tho.

After do you see diamond?

I prefer filling my loop with coffee, Then having a drain valve to fill my mug whenever i want some.

The weight is a problem, be sure to use some dice, a bottlecap, and-or a bottle of hot sauce to keep it from sagging while the coffee is on top of it.