i had a delta die on my sk-6 n my tbird 1.4, the system would start to boot and then crash out before windows got done loading, took me awhile to figure it out because i cn't hear the delta over the 2 sunon 120s and my case itself kills noise pretty well
it did leave an image burned into the bottom of the sk-6 though.. that little square design thingy in the corner of the core..still fully functional though
point is, get a panaflo or other quieter fan for it, you'll have no stability with passive cooling and that hsf