Have you actually seen him playing Ark at those settings? I would estimate that it would only get around 30fps on low settings in 1080p. Your friend may have a resolution that's even less than 1080p which gives him these graphics.
Also not sure why you would need to open the CPU to check which PSU you have. As far as I know, the CPU doesn't even open lol. You're going to need a sufficient PSU so that you ...
Well I played with him in ARK, we were allies, and everyone would make fun of me for playing with play dooh graphics (I could go for medium but I prefer smooth fps over graphics) this in my dad's computer of course (which is a good pc). So yeah I believe him, I said the same thing as you but I don't see why would he lie, he told me I would get a refund in case the card sucks.
My PC's resolution is lower than 1080p, I forgot the actual screen's res, but is lower than 1080. Also, is there a way to check my power supply without opening my pc?
I'd wait for RX 460, or save up a little and get Sapphire's RX 480, you'd probably get better performance if you get a GTX 1060 (same price), but the 480 is future proof, (DX 12 and Vulkan optimized)
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Yeah good idea