Radeon HD 6770 1GB vs Radeon HD 7970

Intro

Compare those specifications to the Radeon HD 7970, which features clock speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon HD 7970		250 Watts
	Difference: 142 Watts (131%)

Memory Bandwidth

Theoretically, the Radeon HD 7970 should be quite a bit faster than the Radeon HD 6770 1GB in general. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 196800 (293%)

Texel Rate

The Radeon HD 7970 is a lot (approximately 229%) better at AF than the Radeon HD 6770 1GB. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 82400 (229%)

Pixel Rate

The Radeon HD 7970 is a lot (approximately 106%) more effective at AA than the Radeon HD 6770 1GB, and also should be capable of handling higher resolutions better. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 6770 1GB		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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.