Radeon HD 5770 vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which features clock speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon HD 7970		250 Watts
	Difference: 142 Watts (131%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should be 244% faster than the Radeon HD 5770 in general, due to its greater bandwidth. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 187200 (244%)

Texel Rate

The Radeon HD 7970 is a lot (more or less 248%) faster with regards to texture filtering than the Radeon HD 5770. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 84400 (248%)

Pixel Rate

The Radeon HD 7970 should be much (approximately 118%) faster with regards to AA than the Radeon HD 5770, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 16000 (118%)

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 (measured in megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.