actually its much more than 20 dollars, even if you only pay 10c a kwh the 70w difference between running your pc and buying a 100 dollar pc that will consume 30w, is about 60 bux a year.
Understood. I was just referring to the potential cost difference for my existing system with and without CUDA turned on. Yes, it doesn't make financial sense by itself, and in hindsight l should have used this as an opportunity to replace the motherboard/cpu instead of an excuse to pull the trigger on that shiny new Nvidia card I already had my eye on. In this specific scenario the difference is small enough that my buyers remorse is minimal and I'll get plenty of other enjoyment out of the GPU elsewhere outside of blue Iris.