Radeon HD 4670 1GB vs Radeon HD 5570

Intro

Compare those specs to the Radeon HD 5570, which has core clock speeds of 650 MHz on the GPU, and 900 MHz on the 512 MB of DDR3 RAM. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 ROPs.

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

The Radeon HD 4670 1GB should theoretically perform a lot faster than the Radeon HD 5570 in general. (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 a lot (more or less 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 lots of anti-aliasing is important to you, then the Radeon HD 4670 1GB is superior to the Radeon HD 5570, but not by far. (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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on 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 get to the maximum fill rate.