Graphics Cards
Your trading software vendor will often not specify a particular graphics card (a.k.a video card) requirement for a computer in either the minimum system requirements or the recommended system requirements. Investing in a good video card can improve the performance of your computer when trading. However, buying a big gaming card is unlikely to help you much since those video cards focus on 3D gaming technology not the 2D technology you need for trading. Selection of video cards is important to hit that sweet spot where you maximize 2D performance. The middle of the product line is usually the right spot to look (not too cheap and not to expensive).
The AMD based graphics cards are more likely to leave "trails" when you move windows around than the NVIDIA based cards. The trails go away when you are done moving the windows.
Graphics cards have several possible types of connections to monitors: DVI, Dual-Link DVI, Display Port, mini-Display Port, HDMI, mini-HDMI and VGA. Some, but not all, can be converted from one type to another with an adapter. More on this can be found here. You will need an individual connection on the back of your computer for each monitor. Monitors with a resolution greater than 1920x1200 are only supported by some graphics cards.
