Radeon HD 4670 512MB vs Radeon HD 5570

Intro

Compare those specifications to the Radeon HD 5570, which has GPU core speed of 650 MHz, and 512 MB of DDR3 RAM running at 900 MHz through a 128-bit bus. It also is made up of 400(80x5) Stream Processors, 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 512MB		70 Watts
	Difference: 27 Watts (63%)

Memory Bandwidth

Theoretically, the Radeon HD 4670 512MB should be a little bit faster than the Radeon HD 5570 overall. (explain)

Radeon HD 4670 512MB		32000 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 3200 (11%)

Texel Rate

The Radeon HD 4670 512MB is quite a bit (approximately 85%) better at anisotropic filtering than the Radeon HD 5570. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 11000 (85%)

Pixel Rate

The Radeon HD 4670 512MB should be a little bit (about 15%) faster with regards to anti-aliasing than the Radeon HD 5570, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 4670 512MB		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 maximum amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If 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 higher screen resolutions.

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

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