|What you need to determine is what you need the GPU to do FIRST. I am not a gamer so integrated graphics work fine for me. |
If you are a gamer on a certain budget then Google for "best graphics card under $xx" (fill in the amount).
Both the two main GPU suppliers ship the basic GPU to card makers who then decide what speed to run it at, what type and amount of RAM to include, what cooling to use, what add in features like bundled games, utilities, warranty length, etc.
Look at the warranty period to determine the quality.
Features may include the type of input/output ports. Utilities for overclocking.
Some cards are aimed at the mult-media aspects. Streaming, HD output, etc.
Lastly, if you are interested in using multiple cards in one system you must be sure your motherboard supports the chip maker. SLI and crossfire are the nvidia and AMD technologies.