Radeon HD 6770 vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which comes with 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 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7970		8225 points
Radeon HD 6770		1520 points
	Difference: 6705 (441%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon HD 7970		250 Watts
	Difference: 142 Watts (131%)

Memory Bandwidth

Performance-wise, the Radeon HD 7970 should in theory be a lot superior to the Radeon HD 6770 overall. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 196800 (293%)

Texel Rate

The Radeon HD 7970 is much (more or less 229%) more effective at AF than the Radeon HD 6770. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 82400 (229%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7970 is superior to the Radeon HD 6770, by a large margin. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 15200 (106%)

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 maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at 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 can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core 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 also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.