Radeon HD 5670 vs Radeon HD 6770 1GB

Intro

Compare those specifications to the Radeon HD 6770 1GB, which comes with a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 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 5670		61 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 47 Watts (77%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB is 5% faster than the Radeon HD 5670 in general, because of its greater data rate. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 3200 (5%)

Texel Rate

The Radeon HD 6770 1GB should be quite a bit (about 132%) faster with regards to anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 20500 (132%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6770 1GB is the winner, by a large margin. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 8200 (132%)

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 maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 applied per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at 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 can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.