Radeon HD 4870 1GB vs Radeon HD 5570

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 107 Watts (249%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 1GB should theoretically be a lot superior to the Radeon HD 5570 overall. (explain)

Radeon HD 4870 1GB		115200 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 86400 (300%)

Texel Rate

The Radeon HD 4870 1GB is much (approximately 131%) more effective at AF than the Radeon HD 5570. (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 17000 (131%)

Pixel Rate

The Radeon HD 4870 1GB is a lot (about 131%) faster with regards to FSAA than the Radeon HD 5570, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4870 1GB		12000 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 6800 (131%)

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 information (counted in megabytes per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it should 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated 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 processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.