REad the manual.
TRy the comp without volcano fan AT YOUR OWN RISK.If everything is ok,then it is fine (tiwthout oc that is) you should be able to do some oc even at default fans though
yeah using non stock HSF would void ur warranty if they knew !
tho its highly unlikely ur proccy get spoiled by the new HSF since they are improvements ... but thats what amd says
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no volacno's man go 4 Thermaltake or Zalman coolers they may b a little costlier than ur VOLCANO but they wud bring temperature down by about 5 - 10 C. what the hell else do u want. reason is clear as they Copper heatsinks and 5500rpm fans where as stock cooling has a aliminium heatsink and a fan that can maximum rotate at 3500rpm