Power & Temperatures
Thanks to its relatively low clock speeds, the Ryzen 3 1200 was light on the go juice with a total system consumption of just 87 watts in our Excel test. Conversely, the 1300X was quite a bit thirstier than you would expect based on the 1200's results.
Although the 1200 is clocked 8-10% lower, it consumed 26% less power when measuring total system draw. The reason for this is that my Asrock board was running the R3 1200 at a much lower voltage than the 1300X and this really helps to reduce consumption. They were closer once overclocked but again I was able to hit 3.9GHz using less voltage than what it took for the 1300X to hit 4.0GHz.
The Cinebench R15 power consumption results are more what I was expecting, that said the 1200 still consumed 17% less power when comparing the total system figures. This put the 1200 on par with the i3-7350K and i5-7500. After overclocking, consumption was still tame and the 1300X system only hit 120 watts.
Temperatures
For temperature testing Ryzen 3 I used its bundled Wraith Stealth cooler which makes the most sense to me, though there are $20 coolers that will enable even lower temps if you find the need.
Out of the box the 1300X peaked at 62 degrees when stressing the CPU, FPU and cache whereas the 1200 hit only 55 degrees. It's worth noting that if we only stressed the CPU, which I feel is a more realistic test, the 1300X maxed out just 49 degrees and only 42 degrees for the 1200. Those are amazing results for a box cooler under heavy load.
When overclocked, the 1200's idle temps were in the low 30s and stressing only the CPU saw temps max out at just 52 degrees while stressing the CPU+FPU+cache saw temps touch on 72 degrees, though 67 degrees was the norm here. I was still using the default fan curve and I would describe the Wraith Stealth as being quiet, which is probably the most shocking part.
Clocked at 4GHz, the 1300X and its extra voltage required the Wraith Stealth's fan to be max out, but even spinning at a full 2600 RPMs the cooler isn't hideously loud. Stressing just the CPU saw temps hit a manageable 63 degrees, but adding stress to the FPU and cache saw peaks of 92 degrees with an average of 83 degrees.
All in all some incredibly good results from the Wraith Stealth when overclocking these Ryzen 3 CPUs.