Radeon HD 5570 vs Radeon HD 6770 1GB

Intro

Compare all that to the Radeon HD 6770 1GB, which features a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 Texture Address Units, and 16 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 6770 1GB		108 Watts
	Difference: 65 Watts (151%)

Memory Bandwidth

Theoretically, the Radeon HD 6770 1GB should be quite a bit faster than the Radeon HD 5570 overall. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 38400 (133%)

Texel Rate

The Radeon HD 6770 1GB will be a lot (more or less 177%) better at texture filtering than the Radeon HD 5570. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 23000 (177%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6770 1GB is the winner, by far. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 9200 (177%)

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 largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units by the core 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 processed per second.

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