I see there's quite a variety of manufacturers making the same type of card, eg Radeon R7 260x. You get MSI, Asus, Powercolor, Gigabyte, Sapphire, etc. I need to know if the same card made by Asus can be stronger than the one made by Gigabyte? I see there's quite a noticeable difference in pricing as well. Does cheaper mean less performance and more expensive mean better performance?