I5 = 65w
Gtx1050 ti = 75w
8Gb ram =10w
Hdd = 15w
Mobo = 50w
Fans = 10w
Grand total = @225w and that's if everything in the pc was running at 100%, which is almost impossible to do. Basically as hard as you could possibly push that pc, you'd still have a hard time getting over 200w usage. Your 450w psu is more than good, it'd still be ok if it was 350w instead.
150w TDP cpu cooler is perfectly acceptable for a 65w cpu. The m9i is 120w TDP and perfectly acceptable for that cpu.
Imagine a 60w light bulb. Puts out a certain amount of light but also gets pretty hot. A 100w light bulb puts out more light, but gets much hotter. What a cpu cooler does is cool the light bulb. You'd need a 100w+ tdp cooler for the 60w light bulb, but a 150w+ tdp cooler for the 100w light bulb. Has nothing to do with how much power the 2 light bulbs use, but how much of that power is converted to heat output.
My rule of thumb is to double tdp for cooler size. If you have a 100w tdp cpu, that's 150w peak, so use a 200w tdp cooler. Keeps maximum temp at 70°C instead of 100°C. So with a 65w i5, a 120tdp m9i is about perfect.