Tbh the spread mod is still beter at about 4 bucks
sp mod is not 40% increase ... at least not for a 1060 GTX.
For a 1060 GTX I see a 20% increase at hash/watt with the SP mod.
No OC - TDP 65%3897 khash avg(default) ----------------- 4980 khash avg(sp-mod)
46.83 khash/watt(default)---------------- 56.27 khash/watt(sp mod)
OC - TDP 100% and 180+ core4535 khash avg(default) ----------------- 5760 khash avg(sp mod)
47.94 khash/watt(default)---------------- 46.58 khash/watt(sp mod)
It's possible to to get around 32% increase but the hash/watt decreases as the SP-mod is using much ALOT more wattage at same OC.