Radeon HD 5670 vs Radeon HD 6950

Intro

Compare those specifications to the Radeon HD 6950, which features GPU core speed of 800 MHz, and 1024 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is made up of 1408 Stream Processors, 88 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 6950		200 Watts
	Difference: 139 Watts (228%)

Memory Bandwidth

In theory, the Radeon HD 6950 should be 150% faster than the Radeon HD 5670 overall, due to its higher bandwidth. (explain)

Radeon HD 6950		160000 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 96000 (150%)

Texel Rate

The Radeon HD 6950 is a lot (more or less 354%) faster with regards to texture filtering than the Radeon HD 5670. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 54900 (354%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6950 is superior to the Radeon HD 5670, by a large margin. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 19400 (313%)

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 data (measured in megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher 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 most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 get to the max fill rate.