Radeon HD 4670 1GB vs Radeon HD 5570

Intro

Compare those specs to the Radeon HD 5570, which features GPU clock speed of 650 MHz, and 512 MB of DDR3 memory set to run at 900 MHz through a 128-bit bus. It also is made up of 400(80x5) Stream Processors, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 4670 1GB		70 Watts
	Difference: 27 Watts (63%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4670 1GB should be much faster than the Radeon HD 5570 overall. (explain)

Radeon HD 4670 1GB		35200 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 6400 (22%)

Texel Rate

The Radeon HD 4670 1GB should be quite a bit (about 85%) better at anisotropic filtering than the Radeon HD 5570. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 11000 (85%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4670 1GB is a better choice, not by a very large margin though. (explain)

Radeon HD 4670 1GB		6000 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 800 (15%)

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 data (in units of megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.