More like 85-88C temps on the X1900XTX hehe. They do run hot, but are designed to do so. They don't start hitting the "danger" zone until >95C, but trying to keep them mid to low 80's is ideal.
They are pretty loud when the fan hits 100% too. They have a thermatic fan that will be quiet and at low rpm's on the desktop, but once the 3d clocks ramp up in games, the fan will pick up to 100% and sound like a dust-buster under your desk lol.
Great cards though! You'll get the best performance with great IQ from single-card in modern games with it.