Regarding the Winchester I also prefer to stay under the 50s, which in my case (high voltage of 1.55-1.57V) is not easy...But with the watercooling I max out @49-51C so I am fine...
However, the maxtemp for the Winchester core is rated at 70C, so everything below is fine for AMD

Therefore no big deal running in the mid-end 50s, what my Zalman 7700Cu gave me before
GPUs can take more...as you can see in the nVidia driver tab, the shutdown-threshold is like 127C (with the new drivers even 145C!). So you can be fine even in the 90s.
However, I also prefer to stay in the low 70s max, so I adjust my VF700s accordingly...