I have a 4,1 that I flashed to a 5,1 and gave to my son for basic web browsing and light gaming. He exclusively plays Roblox on the machine. I installed a Radeon RX 480 (8gb) which uses a single 6-pin connector. However, randomly, the machine will shut down after a few minutes to about a day from him playing this game. I'm thinking it is the GPU that is causing this, as I installed the stock Radeon HD 4870 and no shutdown has occurred since. Is it possible that the single mini 6-pin to 6-pin connector isn't supplying the card with enough juice? Is there a dual mini 6-pin to single 6-pin cable that I can purchase to funnel all available power to the single 6-pin port on the RX 480? I did some light Google searching, but came up empty handed. Thoughts?