Radeon HD 4670 512MB vs Radeon HD 4830 512MB

Intro

Compare all that to the Radeon HD 4830 512MB, which makes use of a 55 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR3 RAM is set to run at a frequency of 900 MHz on this specific model. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 25 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 512MB will be 80% faster than the Radeon HD 4670 512MB in general, because of its higher data rate. (explain)

Radeon HD 4830 512MB		57600 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 25600 (80%)

Texel Rate

The Radeon HD 4670 512MB should be much (approximately 30%) better at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 5600 (30%)

Pixel Rate

The Radeon HD 4830 512MB should be a lot (approximately 53%) more effective at FSAA than the Radeon HD 4670 512MB, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 3200 (53%)

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 data (measured in MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 can be applied in one second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.