I'm afraid XFX5770s even at stock and 100% fan don't go lower than 66C in afterburner at full load for me... ;S
78C was wrong, from memory. 71C. Also, this the Afterburner temps, and ATi CCC reads 66C, however, I'll go with the higher ones from afterburner as worst case..
The I have a large fan covering everything on the closest-to-front 2/3s of the graphics card, too
Why do the capacitors reach so high a temperature, are they rapidly charging and discharging for voltage regulating purposes? ("switching"?)
If they're capacitors, why can't I just go and buy some equivelant, higher-maximum voltage high quality ones, de-solder the old ones, and put on the newer ones?