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?
Yeah good idea
Here is a video of someone benchmarking their GTX560 https://www.youtube.com/watch?v=nYVxU6hPU8I
Here is a video of someone benchmarking their GTX950 https://www.youtube.com/watch?v=1oUuOrzPchY
There is a huge difference in Ark Survival and many other games as well. The fact that your friend is offering you a refund is just sketchy too lol. It just makes no sense at all to me why you would want to spend MORE money on something that is simply worse, which won't be able to play modern games with good settings at a reasonable fps.
Also, you would probably need to open up the PC to check the power supply unless it says it on the outside where you plug it in. However, all you would need to do would be just unscrewing a panel and putting it back on so it shouldn't be difficult.