ECC errors in L3 cache - critical or not?

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http://serverfault.com – On a linux server (8x Quad-Core AMD 8378), I'm getting the following errors: [Hardware Error]: MC4_STATUS[-|CE|MiscV|-|AddrV|CECC]: 0x9c294c00001d018b [Hardware Error]: Northbridge Error (node 4): ECC error in L3 cache tag. [Hardware Error]: cache level: L3/GEN, tx: GEN, mem-tx: SNP [Hardware Error]: Machine check events logged This has happened three times during the last month, but never before (server running for 3 years). From a quick google-search, it seems this is a serious matter. However, the vendor support technician said: I have seen these errors MANY times, and unless you a (HowTos)