Radeon HD 4670 1GB vs Radeon HD 6950

Intro

Compare that to the Radeon HD 6950, which comes with a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is comprised of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon HD 6950		200 Watts
	Difference: 130 Watts (186%)

Memory Bandwidth

In theory, the Radeon HD 6950 will be 355% faster than the Radeon HD 4670 1GB in general, because of its higher data rate. (explain)

Radeon HD 6950		160000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 124800 (355%)

Texel Rate

The Radeon HD 6950 is quite a bit (about 193%) better at texture filtering than the Radeon HD 4670 1GB. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 46400 (193%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6950 is the winner, and very much so. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 19600 (327%)

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 (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.