Radeon HD 6750 1GB vs Radeon HD 6770

Intro

Compare all of that to the Radeon HD 6770, which comes with a GPU core clock speed of 900 MHz, and 512 MB of GDDR5 RAM set to run at 1050 MHz through a 128-bit bus. It also is made up of 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 6770		108 Watts
	Difference: 22 Watts (26%)

Memory Bandwidth

Performance-wise, the Radeon HD 6770 should in theory be a bit superior to the Radeon HD 6750 1GB in general. (explain)

Radeon HD 6770		67200 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 3200 (5%)

Texel Rate

The Radeon HD 6770 will be quite a bit (approximately 38%) faster with regards to texture filtering than the Radeon HD 6750 1GB. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 9900 (38%)

Pixel Rate

The Radeon HD 6770 will be much (approximately 24%) better at full screen anti-aliasing than the Radeon HD 6750 1GB, and also should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 2800 (24%)

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 largest amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the 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 amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.