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Bus width indicates how much data can get from the memory to the graphics card in a single cycle. It is measured in bits (bit) and typical values ​​are 64 or 128-bit, with more powerful models, then 256 or 384 bit. A higher value indicates higher throughput and higher performance of the card.   

The memory stores information necessary for graphic calculations. A higher number in the end indicates newer technology. Today's standard is the GDDR5, which transmits 4 bits per cycle.

Value is given in Hz and indicates the frequency of the graphic processor.

Memory frequency is in Hz and indicates number of cycles in one second. The bigger value, the better. 

The figure indicates the highest supported version of DirectX. This is a set of programming interfaces from Microsoft that are designed for Windows operating systems. Currently, the latest version of DirectX 12.0x.

Multiple graphics cards can be connected to some motherboards, for example using technology Scalable Link Interface (SLI) or CrossFireX. The result is increased speed of rendering, which is important, especially in games.

Determining the utilization of the graphic card. Graphic card for multimedia or office has different parameters than a professional model, or a card for gaming. 

Outputs for connection to a monitor. For analog, VGA connector is used, the digital is DVI or the newer HDMI and DisplayPort (DP). Digital interfaces offer better image quality, higher resolution (up to 4K), the simultaneous transmission of audio (HDMI, DP) and even ethernet (HDMI, depending on specification).  

To connect the graphics card to the computer, mostly used is the slot PCI-Express, x16 option is the standard. 

Means the number of slots that the cooler takes up the computer. We can come across one, two or three slot design.

For removal of unwanted heat is used either the passive cooling (silent) or active cooling (fan). there is also the possibility of alternative cooling (water cooler).

TDP (Thermal Design Power, or the Proposed thermal power) is given in watts and is the highest possible heat output, which the cooling of the graphics card has to be able to spread into the environment. Value can serve as a rough idea about the thermal performance of the graphics chip.  

To maximize the performance of your computer must have a sufficiently powerful source. The value is stated in watts, and indicates the minimum appropriate power source. 

Graphics cards with lower wattage power supply just need PCI-Espress slot, more powerful models with higher consumption require an additional power source.