Seemed to work fine at first, just made the whole thing louder. A couple months later though, I started receiving an error relatively frequently on startup. It wasn't the Red Ring of Death, but an error nonetheless, along with a wierd moaning whirring coming from the Xbox. I thought the Xbox was going bad. I started looking for another one of these for my new Elite, and came across all the other reviews about this bad product. I took it off my old Xbox, and it worked great again. Luckily as far as I can tell it didn't do any noticeable long lasting damage. Hopefully it will still last awhile when I give it to my brother. It's definitely not worth the risk!