Originally posted by schmidtbag
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ECC is providing ability to detect and correct single bit errors and to detect multi-bit errors, and this ability isn't invalidated by overclocking the RAM.
Overclocking increases your chances of getting memory errors, but ECC will deal with that until you get very very overboard with your OC and start getting multi-bit errors. It will also provide a very useful log of all RAM errors so you know how far you can push the OC with much more info than just "The OS didn't crash yet" which is what you have on a normal consumer system. This allows a much more safe and scientific approach to the matter.
Then of course what you do with your system depends from the target, not all servers are supposed to be 0-downtime-no-matter-the-cost.
Overclocking your company's supercritical database server is probably NOT a good idea, while OC your compute nodes or webserver farm make a lot more sense, and there ECC is going to be pretty useful as I said above.
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