Interesting.
Check out the conditions for that MTBF, on the 4010: 25 deg C, and 65% RH.
If you can dig up the same info for the Deltas... (I'm bandwith impaired!)
In general, electronic component's life is reduced by a factor of 5, for every 20 deg C temp increase. This probably won't apply "straight out" here, but should give you a rough idea. The air coming out of the CPU certainly isn't 25 deg C...
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