Radeon HD 4830 1GB vs Radeon HD 5670

Intro

Compare those specs to the Radeon HD 5670, which makes use of a 40 nm design. AMD has set the core frequency at 775 MHz. The GDDR5 memory works at a speed of 1000 MHz on this specific card. It features 400(80x5) SPUs along with 20 TAUs and 8 ROPs.

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

Theoretically speaking, the Radeon HD 5670 will be 11% faster than the Radeon HD 4830 1GB overall, because of its greater data rate. (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 little bit (approximately 19%) more effective at texture filtering than the Radeon HD 5670. (explain)

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

Pixel Rate

The Radeon HD 4830 1GB is much (approximately 48%) more effective at anti-aliasing than the Radeon HD 5670, and will be able to handle higher resolutions without losing too much performance. (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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few 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.