• How many Monitors you need to connect to your computer ?
• Are you planning to add more RAM to your computer ?
• Do you have required Monitor(s) or other display device such as Projector? In case you do have the required Monitor or other display device such as Projector, then take a note of the port type of the display device. Port type referred to in the previous line refers to the type of connector which is connected to computer or laptop. Few Port types are VGA, DVI, S Video, DVI D, DVI A, DVI I, or any other port type.
• Depending on the distance of Monitor from your computer, would you require extra cables (Power Cord or Data Cord)?

There are many other factors such as cost, availability, brand , purpose of the extra Monitor and much more. In case you are buying a dual monitor video card, be patient, do enough research with possible friends such as google, amazon and any other websites you can locate.

Dual Monitor Graphics cards can be identified with two ports connected to the same graphics card. There are many types of ports (or connectors on the graphics card to which you can connect your monitor to) such as VGA Port, DVI Port, DisplayPort, S Video Port and many other types of ports. VGA Port is blue in color and has 3 rows of holes in it with 15 holes in it whereas DVI Port is white in color. A simple Dual Monitor Graphics card can have 3 ports i.e. One VGA Port, One DVI Port and one S Vide o Port or it can have 2 DVI Ports and one S Video ports or may be some other combination of ports.

Browse to the Hardware Category from the top of the page to know exactly what you are looking regarding hardware for setting up and using dual monitors. From Dual Monitor Software perspective, Windows does have good support for dual monitors for latest operating system users.

Super Desktop Computers/PC’s comes with Quad Monitor graphics card or video card which can support upto four monitors. There is no need of adding any  additional hardware. In case you do have an existing computer with single monitor support, you can get a Quad Graphics Card to support upto 4 monitors / displays simultaneously. Companies like Matrox, Nvidia and ATI Manufactures Quad Graphics card. Quad display Graphics card can be used for increasing productivity in business, graphics designing, for gaming purposes, etc. One such Quad display Graphics card from NVIDIA is NVS 450, there are many such cards available and the price range can vary a lot depending on the technical specifications, brand name, etc.

List of  Few Quad Monitor Computers
Given below are few Quad Monitor Computers which can support upto 4 monitors for displaying the output of the computer.
In case you are planning to buy a Quad Monitor Computer, given below are some of the Quad Monitor Computers which can give you an idea of technical specifications, price, etc. Price range of given below Quad Monitor Computers can vary from $1095.99 to $1,459 depending upon Motherboard type, Brand Name, Graphics Card, Processor Speed, etc.

• SUPER PC /Quad Monitor Computer Intel Core 2 Duo  2.8 GHz Intel Core 2 Duo (Dual Core).
• SUPER PC /Quad Monitor Computer  Intel Core 2 Duo 2.33Ghz Intel Core 2 Duo (Dual Core).
• SUPER PC /Quad Monitor Computer  AMD Phenom I 2.3 Ghz AMD Phenom I.
• SUPER PC / Quad  Monitor Computer  AMD Phenom II 2.6Ghz AMD Phenom II.

As said above in case you are looking for a Quad Monitor Computer you can have two choices, one would be to get a new Quad Monitor Computer or second choice can be to get a Quad Display Graphics card and connect it to your existing Desktop Computer with four Monitors (note the connector type of the Quad Monitor graphics card and make sure you can plugin your monitor to that graphics card or else you might require an appropriate converter). In case you are just looking to display output of computer to four monitors only and do not want to seperately control the monitors, you can go for a cheaper option (i.e. Video Switch) or in cse you do want to display different content onto every monitor using a desktop compute then a Quad Monitor Computer or a Quad Monitor graphics card can be a choice.

Radeon is the brand name for graphics card manufactured by the ATI Company. There are many graphics cards for a desktop computer from Radeon for connecting dual monitors to a single computer system. The Radeon graphics cards can have different connector types such as dual head 15-pin VGA connector, DVI connectors, etc. The connector type is one of the important things to note about a dual head graphics card. You would need dual monitors with the same connector type as supported by your dual monitor graphics card or in case the connector type in the graphics card does not match with your monitors, then you would need converter(s) to connect your monitor(s) with the graphics card. This blog entry talks about different types of ATI Radeon dual monitor graphics cards and lists of few Radeon dual monitor graphic cards.

Radeon Graphic Cards Series

Radeon graphics cards come in  many series which is classified according to the application programming interface and Direct X technology supported where Direct X is an of API  using which graphics intensive programs are written (such as video games, etc). The series of ATI Radeon graphic cards depends on the application programmable interface (API) as mentioned below.
Direct X 9.0  Technology  Series are Radeon 9500 – 9800, X300 – X600, X1050
Direct X 9.0b Technology Series are Radeon X700 – X850
Direct X 9.0c Technology Series of  Radeon  X1300 – X1950
Direct X 10.0 High Definition  2400 HD 2600 and HD 2900

The series of graphics cards included with Direct X 9.0b , 9.0c , 10.0 technology are classified in the group OpenGL.  Now a days almost all the latest technology  ATI Radeon Graphics cards support OpenGL.

List of  Few Radeon Dual Monitor  Graphics Cards
Given below are few of the Radeon Dual Monitor Graphic Cards in the rough price range of $90 to $400 depending upon the series, memory capacity, processor speed, etc.

• 512MB ATI RADEON X1650PRO PCI-E Express Dual VGA/DVI  
• Radeon HD 2600XT 256MB GDDR3 PCI Ex16.
• Radeon HD 2600XT 512MB GDDR3 PCI Ex16.
• Radeon HD 2600XT 256MB GDDR4 PCI Ex16.
• Radeon 7500.

The above information is provided for reference purpose only. Please do a little more research (A good place to start may be at the ATI Radeon website) to find out more information about the dual monitor graphic cards by ATI Radeon. However other entries in this blog can be helpful as well to know more about dual monitor graphics cards.