GeForce GT 320 vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which comes with a clock speed of 575 MHz and a GDDR4 memory speed of 900 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 52 Watts (121%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 1GB will be 128% quicker than the GeForce GT 320 in general, because of its greater bandwidth. (explain)

Radeon HD 4830 1GB		57600 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 32320 (128%)

Texel Rate

The Radeon HD 4830 1GB is much (approximately 42%) more effective at texture filtering than the GeForce GT 320. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 5440 (42%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4830 1GB is superior to the GeForce GT 320, by a large margin. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 4880 (113%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.