Oh it is alright.
I have a thing on my desktop that tells me processor usage and memory and stuff.
2gigs of ram and 90+% of CPU for around an hour.
I guess it's not super constant because it wasn't multi threaded all the way through, but it was still running full time.
Not mentioning gaming for 6 hours with GPU and CPU near maxed out all the time.
They're made to work like that. It's fine, just gets a bit warm. But I never got above like 80C internally I think