Tantalums will go boom eventually, they cannot stand much over voltage at all by design (which you get when regulators in the PS age). I have a Daystar 040 PDS accelerator card I recieved with a blown tantalum capacitor, works fine as is but I replaced it anyway.

http://picasaweb.google.com/teozenios/NubusCards#5067908435668848786

Bottom right, hard not to miss.