Radeon HD 4670 512MB vs Radeon HD 5670

Intro

Compare all that to the Radeon HD 5670, which has GPU core speed of 775 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is made up of 400(80x5) Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 4670 512MB		70 Watts
	Difference: 9 Watts (15%)

Memory Bandwidth

In theory, the Radeon HD 5670 should be 100% faster than the Radeon HD 4670 512MB in general, because of its higher bandwidth. (explain)

Radeon HD 5670		64000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 32000 (100%)

Texel Rate

The Radeon HD 4670 512MB is quite a bit (approximately 55%) more effective at AF than the Radeon HD 5670. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 8500 (55%)

Pixel Rate

The Radeon HD 5670 is a little bit (more or less 3%) more effective at anti-aliasing than the Radeon HD 4670 512MB, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 5670		6200 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 200 (3%)

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 max amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better 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 figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.