My custom PC

First part arrived today: My Motherboard

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I'm going to be ordering my GFX card, however I've been told it's not the optimum one for my build?

Due to having a ATX Motherboard and having a mid-tower Case, the GFX card should be a full sized card? I'm I right in saying so?

I know I can have a smaller card and the performance isn't much different... But would it make a difference to swap it out to a bigger card?

I'd buy this one - https://uk.pcpartpicker.com/part/gigabyt...1gaming8gd

As opposed to the one i have selected already - https://uk.pcpartpicker.com/part/asus-vi...0dcmoc4gd5