Radeon HD 5750 512MB vs Radeon HD 6770 1GB

Intro

Compare all that to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory is set to run at a frequency of 1050 MHz on this specific model. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 512MB		86 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 22 Watts (26%)

Memory Bandwidth

In theory, the Radeon HD 5750 512MB will be 10% faster than the Radeon HD 6770 1GB overall, due to its greater bandwidth. (explain)

Radeon HD 5750 512MB		73600 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 6400 (10%)

Texel Rate

The Radeon HD 6770 1GB is quite a bit (about 43%) better at anisotropic filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 10800 (43%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6770 1GB is a better choice, by a large margin. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 3200 (29%)

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 (in units of megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to 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 maximum fill rate.