Well I can only say that it also maybe depends on your player. I was unfortunate that I had a 'inferior' player which I also couldn't overclock to 1.7GHz (more info: https://www.head-fi.org/threads/fii...dual-card-slot.828402/page-1000#post-14924078). It became extremely hot when connected to a charger or when trying to change firmwares etc. Sold this player and returned to my trusty X5 II. After a few months I bought a new X5 III and this time it was not a problem to overclock and it also didn't become very hot. And it feels like a complete different player.