Radeon HD 4670 512MB vs Radeon HD 7970

Intro

Compare those specifications to the Radeon HD 7970, which has a clock speed of 925 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 7970		250 Watts
	Difference: 180 Watts (257%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 is 725% faster than the Radeon HD 4670 512MB overall, because of its higher bandwidth. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 232000 (725%)

Texel Rate

The Radeon HD 7970 will be quite a bit (more or less 393%) more effective at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 94400 (393%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7970 is superior to the Radeon HD 4670 512MB, by far. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 23600 (393%)

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 (counted in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock 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 fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.