OK, basically I am following this guide to make myself a nice Rheobus using the LM317/T voltage controller chips. All I want to know is how hot are these things expected to get with a single 80mm case fan running off each of them? I've got some nice neat heatsinks stuck to them (not a chunky as those in the above guide...) and I'm worried they may not be sufficient. Some pre-fab'd kits I've seen have huge heatsinks on em. Anyone know?