Radeon HD 4770 vs Radeon HD 6970

Intro

Compare all that to the Radeon HD 6970, which features GPU core speed of 880 MHz, and 2048 MB of GDDR5 memory running at 1375 MHz through a 256-bit bus. It also features 1536 SPUs, 96 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon HD 6970		250 Watts
	Difference: 170 Watts (213%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6970 should theoretically be a lot better than the Radeon HD 4770 in general. (explain)

Radeon HD 6970		176000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 124800 (244%)

Texel Rate

The Radeon HD 6970 will be a lot (more or less 252%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon HD 6970		84480 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 60480 (252%)

Pixel Rate

The Radeon HD 6970 should be quite a bit (about 135%) better at anti-aliasing than the Radeon HD 4770, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6970		28160 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 16160 (135%)

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 past the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core clock 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 that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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 bandwidth is, the lower the potential to get to the maximum fill rate.