Geek Daily

By: Andrew Gates

The graphics card is a vital performance component of your computer, particularly if you play 3D games, or work with graphics and video content. The graphics card sits in an expansion card slot in your PC and it is specifically designed to process image data and output it to your monitor, enabling you to see it. A graphics card works by calculating how images appear, particularly 3D images, and renders them to the screen. 3D images and video images take a lot of processing capacity, and many graphics processors are complex, require fans to cool them and need direct power supply. The graphics card consists of a graphics processor, a memory chip for graphics operations, and a RAMDAC for display output. It may also include video capture, TV output and SLI and other functions.

Graphics Cards

What are your needs?

The first decision you need to make is whether you need a graphics card for handling 3D images or whether you are simply requiring 2D image rendering. For 2D requirements, you need only a low-cost solution. In many cases, an integrated graphics solution will suffice for 2D applications.

However with 3D graphics, the performance of the graphics card will impact directly on the frame rate and image quality of 3D programs and games. The differences between the low and high-end cards can be substantial, both in cost and performance.

Rendering 3D graphics is like lighting a stage, both the geometry of the shapes in question and the lighting of it need to be taken into account. The geometry of an image calculates the parts of an object that can and can’t be seen, the position of the eye and its perspective. The lighting is a calculation of the direction of the light sources, their intensities and the respective shadows that occur. The second part to presenting a 3D image is the rendering of colours and textures to the surfaces of the objects, and modifying them according to light and other factors.

Most modern graphics cards include a small microchip called the Graphics Processing Unit (GPU), which are provide the algorithms and memory to process complex images. They reduce the workload of the main CPU, and provide faster processing. Different graphics cards have different capabilities in terms of processing power. They can render and refresh images up to 60 or more times per second, calculate shadows quickly, create image depth by rendering distant objects at low resolution, modify surface textures fluidly and eliminate pixelation.

What Specifications to Consider

Processor clock speed

This impacts on the rendering capability of the GRU. The clock speed itself is not the critical factor. Rather it is the per-clock performance of the graphics processor, which is indicated by the number of pixels it can process per clock cycle.

Memory size

This is the memory capacity that is used exclusively for graphics operations, and can be as much as 512MB. The more demanding your graphics applications are, the better you will be served with more memory on your graphics card.

16-32M
64M
128M
256M
512M
640M and more

Memory bandwidth

One thing that can slow down 3D graphics performance is the speed at which the computer delivers information to the graphics processor. A higher bandwidth means a faster data transfer, resulting in faster rendering speeds.

Shader model

DirectX Shader Models allows developers control over the appearance of an image as it is rendered on screen, introducing visual effects like multi-layered shadows, reflection and fog.

Fill rate

This is the speed at an image can be rendered or “painted”. This rate is specified in texels per second, the number of 3D pixels that can be painted per second. A texel is a pixel with depth (3D). The fill rate comes from the combined performance of the clock speed of the processor and the number of pixels it can process per clock cycle, and will tell you how quickly an image can be fully rendered on screen.

Vertices/triangles

Graphics chips don’t work on curves, rather they process flat surfaces. A curve is created by multiple flat planes arranged to look like a curve. 3D objects are created with multiple triangular surfaces, sometimes hundreds or even thousands, tessellated to represent the curves and angles of the real world. 3D artists are concerned with the number of polygons required to form a shape. There are two different types of specification: vertices per second (I.e., angles the triangles), and triangles per second. To compare one measure with the other, you have to take into account the fact that adjacent triangles share vertices.

Anti-aliasing

A technique used to smooth images by reducing the jagged stepping effect caused by diagonal lines and square pixels. Different levels of anti-aliasing have different effects on performance.

RAMDAC

The Random Access Memory Digital to Analogue Converter takes the image data and converts it to a format that your screen can use. A faster RAMDAC means that the graphics card can support higher output resolutions. Some cards have multiple RAMDACs allowing that card to support multiple displays.

TV-out

Some graphics cards provide the option to connect a television via either a composite (RCA) or S-Video connector. TV Out

S-video Out
S-video In and S-video Out (VIVO)
YPbPr Connection for HDTV

DVI

Some graphics cards include a connector for DVI monitors, handy because a lot of LCD screens support DVI. DVI offers better image quality than the standard VGA connector.

Dual-head

Dual-head is a term used when two monitors are used side by side, stretching your desktop across both.

SLI (Scalable Link Interface.)

With SLI you can couple two graphics cards in your computer, enabling each card to take half the rendering thereby doubling the performance.

When considering your graphics card, it pays to think about how much you need your computer to process your graphics output. Using a high end graphics card with a high pixels per clock rating, large memory, fast processor and other features means that you can run the latest games efficiently, or work in intensive graphics development.

Different Models

While there are many vendors of graphics cards, there are actually only two major manufacturers of chips for graphics cards. Nearly every graphics card on the market features a chip manufactured by either ATI or Nvidia. Cards using the same graphics chip will perform roughly the same as each other. However, even though they use the same chip, some feature slightly higher clock speeds, as well as manufacturer guaranteed overclocking-an even higher clock speed than that specified. Other factors that will influence your decision should include the amount of memory a card has (128MB, 256MB, 512MB) and its additional features, such as TV-Out and dual-screen support.

Roberto Sedycias

Since it became commercially available back in the early eighties, notebooks called the attention of computer users because of its small size and portability. Not much of a commercial success back then, it only took a short time before the computer industry improved this item, up to a point that is now considered to be one of the best selling computer consumer products.

For one who intends to buy a budget notebook, he may have some difficulties in picking the right one, since there are several notebook manufactures offering so many models. Budget notebooks are in a class by itself with basic features but capable of delivering full solutions for computer related tasks.

For an easy guide to budget notebooks, check the following major manufactures:

SONY
Sony VAIO notebooks are fashioned products targeted to consumers who demand flexibility and power without compromise. It is expected to find features such as 15.4“ WXGA, duo core processor and 100 gb hard disk. Although not the cheapest of budget notebooks, it compensates the higher price by offering more technological features.

Most common features one can expect from Sony budget notebooks: 1 - Intel Core Duo Processor T2250 1.72 Ghz; 2 - Windows Vista; 3 - 1 gb DDR2 ram; 4 - Widescreen XGA display type; 5 - Intel graphics media accelerator 950; 6 - 100 gb SATA hard disk 5400 rpm; 7 - CD-RW/DVD rom; 8 - wireless lan 802.11 a/b/g; 9 - Modem and Lan port 10/100; 10 - USB connectivity; 11 - It weighs around 6.5 pounds; 12 - Lithium ion battery up to 5.5 hours; 13 - One year limited warranty. Price starts from U$ 929.00 and up according with optional accessories.

DELL
With features such as 15.4“ WXGA, duo core processor and ATI Radeon Xpress graphics, Dell budget notebooks offer a flexible combination of power, mobile productivity and entertainment at a good price.

Most common features one can expect out of these notebooks are: 1 - AMD Turion 62 X2 1.8 ghz/1mb cache processor; 2 - Windows Vista; 3 - 512 mb ram; 4 - Widescreen XGA display type; 5 - ATI Radeon Xpress 256 mb video graphics chipset; 6 - Up to 80 gb hard disk; 7 - CD-RW/DVD rom; 8 - It weighs around 6 pounds; 9 - 9-cell lithium ion battery; 10 - One year limited warranty. Price starts from U$ 549.00 and up according with optional accessories.

TOSHIBA
All Toshiba budget notebooks feature an 15.4“ diagonal WXGA display, DVD optical drive which reads and writes up to 11 formats, high speed wireless lan (802.11 b/g) for easy connection in networks.

Most common features one can expect out of these notebooks are: 1 - Intel Celeron processor with 1+ Ghz; 2 - Windows Vista; 3 - 512 mb ram; 4 - Widescreen XGA display type; 5 - Radeon Xpress 200M video graphics chipset; 6 - 60 gb hard disk; 7 - CD-RW/DVD rom; 8 - wireless lan but no Bluetooth connectivity; 9 - Modem and Lan port 10/100 mbps; 10 - USB and firewire connectivity; 11 - It weighs around 5 pounds; 12 - 4-cell lithium ion battery; 13 - Tv-out s-video; 14 - One year parts and labor warranty. Price starts from U$ 599.00 and up according with optional accessories.

HP
HP Budget notebooks with features such as 15.4“ display screen, AMD Sempron 3500+ and a sophisticated black resin finish, offer an attractive mix of style, mobility and performance.

Expected features one can find in this HP notebook category: 1 - AMD Sempron 3500+; 2 - Windows Vista; 3 - 15.4“ WXGA Widescreen; 3 - 512 mb ddr2; 4 - CD-RW/DVD rom; 4 - Wireless connectivity 802.11b/g wlan; 5 - It weighs around 7 pounds; 6 - Nvidia video graphics chipset with 256 mb; 7 - 6-cell lithium ion battery; 8 - USB, lan and modem port; 9 - Integrated stereo speakers; 10 - 60 gb SATA hard disk; 11 - Tv-out s-video; 12 - One year warranty in parts and labor. Price starts from U$ 569.00 and up according with optional accessories.

A while ago portable electronics devices were a luxury at an expensive price. Nowadays it became an affordable must have kind of product for lots of people. Notebooks are in this category for sure! And basic notebooks are the best option for those who are in a tight budget. So, if portability is a must for your personal or professional computer related tasks, waste no more time. Get yourself a budget notebook!