Crippled ES chips could be used to test early motherboard and/or bios compatibility. During early motherboard development phases the only question is "will it work" and not "will it work well."
Later they would want to issue non-crippled chips for stress and performance testing; but they can keep much tighter control of the non-crippled chips. (If this truly is an early crippled ES sample it is probably 6 months old if not older... because at this time I would expect non-crippled chips to be issued by now.)
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