Radeon HD 6670 (OEM) 1GB vs Radeon HD 7970

Intro

Compare those specs to the Radeon HD 7970, which uses a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 memory runs at a frequency of 1375 MHz on this model. It features 2048 SPUs along with 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 6670 (OEM) 1GB		63 Watts
Radeon HD 7970		250 Watts
	Difference: 187 Watts (297%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 will be 313% quicker than the Radeon HD 6670 (OEM) 1GB overall, because of its greater bandwidth. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 200000 (313%)

Texel Rate

The Radeon HD 7970 is much (about 517%) faster with regards to texture filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 99200 (517%)

Pixel Rate

The Radeon HD 7970 should be a lot (more or less 363%) better at anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 23200 (363%)

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 (measured in MB per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 texture map elements (texels) that are processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at handling 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 could 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 clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.