81 degrees is on the edge. might need to look for a good cooler, anything above 75 is no no for your proc.

you can test with furmark for gpu, just do it for 10 minutes or so first if you're not confident with the temps (make sure you uncheck 'extreme burning mode' option). you can stop anytime, if it gets super hot.

that would be one of the decent ones. and it's not that expensive too

i personally like tuniq tower 120 extreme, a bit pricey tho (performance + looks).