I'm not doing a good job of explaining this I guess....the TDP of the CPU @ stock speeds is irrelevant.
The TDP of the 5960x is also 140W and as we saw, idle to OC load represents a 300+ watt increase.
What's the difference in power consumption from the 5960x ? Here's what base systems w/ the stock CPUs are drawing before overclocking (idle / load)
5820k = 68 / 185 watts
5830k = 68 / 187 watts
5960x = 69 / 189 watts
Lets do the math ...
Going from idle to load adds ~ 120 watts. Going from load to OC load adds ~ 190. So even if we assume at idle the CPU is consuming 0 watts, overclocking it and putting it under load adds 310 watts
From THG forums
"The Xeon E5 1650 V3 is essentially the exact same thing as a , i7 5930K"
Simply put, any potential advantage you might gain from overclocking a X79 system, will be negated by the inability of the lower budget cooler to handle much of an OC.
Assuming your time is worth some monetary value, if you are going to invest an hour of your time installing a cooler, at what point does continuing to search for a part that the manufacturers has decided not to offer anymore presumable because of a lack of demand. Choices you might consider ... each one bringing you a higher level of performance:
$25 Buy an Evo version that comes with the bracket.
$40-50 Buy a Cryorig or Scythe cooler
$65 Buy a Phanteks