Radeon HD 5770 vs Radeon HD 7970

Intro

Compare all of that to the Radeon HD 7970, which features a clock frequency of 925 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 384-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation 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

The Radeon HD 7970 should theoretically perform a lot faster than the Radeon HD 5770 in general. (explain)

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

Texel Rate

The Radeon HD 7970 will be much (about 248%) faster with regards to anisotropic 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 is quite a bit (about 118%) faster with regards to full screen anti-aliasing than the Radeon HD 5770, and also will be able to handle higher resolutions without losing too much performance. (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: Memory bandwidth is the max amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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