Upgrading your computer is an exciting prospect. But it's also a complicated one.With graphics cards suffering a price hike from crypto-currency mining, things are even more complex right now. Knowing how to shop for a new card is an art in itself.If you're determined to ditch your old graphics card, here's everything you'll need to know about upgrading.When to UpgradeIt's not only a matter of "what" but also "when".You might find yourself tempted to splash out on a new graphics card the moment your performance starts to…