Radeon HD 4830 1GB vs Radeon HD 5670

Intro

Compare those specs to the Radeon HD 5670, which has a GPU core clock speed of 775 MHz, and 1024 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also features 400(80x5) SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 34 Watts (56%)

Memory Bandwidth

In theory, the Radeon HD 5670 should be 11% quicker than the Radeon HD 4830 1GB overall, because of its greater bandwidth. (explain)

Radeon HD 5670		64000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 6400 (11%)

Texel Rate

The Radeon HD 4830 1GB will be a small bit (approximately 19%) better at AF than the Radeon HD 5670. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 2900 (19%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4830 1GB is a better choice, by far. (explain)

Radeon HD 4830 1GB		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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.