Radeon HD 4830 512MB vs Radeon HD 5670

Intro

Compare those specs to the Radeon HD 5670, which makes use of a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this card. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 34 Watts (56%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5670 should in theory be just a bit superior to the Radeon HD 4830 512MB in general. (explain)

Radeon HD 5670		64000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 6400 (11%)

Texel Rate

The Radeon HD 4830 512MB should be just a bit (about 19%) faster with regards to anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 4830 512MB		18400 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 2900 (19%)

Pixel Rate

The Radeon HD 4830 512MB will be much (approximately 48%) better at AA than the Radeon HD 5670, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 3000 (48%)

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: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total 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 maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.