Compressed air (well compressed liquid gases which isn't air at all) is perfectly safe if used correctly.
Always, make sure the device your cleaning hasn't got power going into it (unplugged), spray upright if you can (should be easy with a gfx card) but in reality it's not a problem if any of the liquid hits your card. I spray the inside of my computer a couple of times a year - and not upright half the time - we all do on this forum. But i do short bursts and clean the end of the nozzle with paper towel in between bursts.
It's usually a refrigerant (flurocarbon - the stuff that's making a hole above the poles) and should evaporate very quickly on contact.
Spray it on a bit of cooper pipe (that same radiator we put the nail polish on) and you'll see what i mean.
Note: it's always wise to shake well and to a test spray first if you haven't used it for while.
Always, make sure the device your cleaning hasn't got power going into it (unplugged), spray upright if you can (should be easy with a gfx card) but in reality it's not a problem if any of the liquid hits your card. I spray the inside of my computer a couple of times a year - and not upright half the time - we all do on this forum. But i do short bursts and clean the end of the nozzle with paper towel in between bursts.
It's usually a refrigerant (flurocarbon - the stuff that's making a hole above the poles) and should evaporate very quickly on contact.
Spray it on a bit of cooper pipe (that same radiator we put the nail polish on) and you'll see what i mean.
Note: it's always wise to shake well and to a test spray first if you haven't used it for while.