Do some Googling and mroe reading and you'll find their problem was that they cut costs by assuming the memory supplied was perfect and that they didn't need to include parity checking or error detection and correction. This is the UltraSPARC3 problem that Tamerlin is talking about.
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Gosling also wrote about being at the mercy of suppliers impacting SPARC and it probably contributed to the problems.
http://nighthacks.com/roller/jag/entry/at_the_mercy_of_suppl...
Do some Googling and mroe reading and you'll find their problem was that they cut costs by assuming the memory supplied was perfect and that they didn't need to include parity checking or error detection and correction. This is the UltraSPARC3 problem that Tamerlin is talking about.