Haven't you heard of Little boy and Fat man ?
I bought one of these for my son at Christmas, and it's had a few issues with overheating. Nothing to worry about if you can undervolt and adjust the fan-curve yourself. But something to be aware of. Having a decent case design is also quite important for extended sessions. Pretty fast card though and this is about the right price.
An efficient card this is not, but 200w is nothing extraordinary for gpus nowadays
This card is hot but what's more important it is very power hunger... Red dragon version i had could draw over 200w at full load. Also it is recommended to have at least 550W psu
I've been using fan curves... pretty much ramping up very high above normal load before you play any intense games... got fed up of Witcher 3 crashing and now it only happens occasionally.