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Cheap cards?

The difference is mostly in the graphics processor that's on the card itself. The first one you linked is a low-profile video card. It uses the Radeon HD-5450 graphics processor. It's a very low-power solution that's really only good for business computers that are too small for big graphics cards, but still (for whatever reason) need something other than onboard video.

The next card you link is the HD-6450. Essentially the same purpose as the HD-5450. It has a bit more power than the 5450. See the "stream processors" count? It doubles. The first card has 80 stream processors, while the second one has 160.

The last card you link is based on the Radeon HD-6670 GPU. This one has 480 stream processors, and is obviously the most powerful card of the bunch you linked. It also is bigger and costs more.

You have good insight though. Not all 2GB cards are equal. Also, video cards that sport 4GB of RAM may not be good either. There are a few slower GPU's out there married to 4 GB of RAM. Are you looking to get a graphics card?
 
Raw processing power. They have more than twice as meany stream processors running at faster clock speeds, memory is faster (gddr5 vs gddr3) and on wider buses, and they have the associated compliment of upgraded components to handle the extra oomph.
 
The difference is whether you want to be able to play games at real settings, or if you're using the card for other purposes (video decoding, etc). Usually more expensive cards have better processors for game rendering (the problem is that more expensive does not always mean better than one that is cheaper).

The simplest way to shop for a card, get a budget, find out what modern cards are available at your budget (try to look for Nvidia GTX 6xx cards or AMD HD 7xxx cards).

Go to this list: http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html
Or this list: http://tpucdn.com/reviews/NVIDIA/GeForce_GTX_Titan/images/perfrel_2560.gif

Get the best ranked card you can afford.
 
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