Radeon HD 4670 512MB vs Radeon HD 6950

Intro

Compare those specifications to the Radeon HD 6950, which comes with core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 1408 SPUs along with 88 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 6950		200 Watts
	Difference: 130 Watts (186%)

Memory Bandwidth

The Radeon HD 6950 should theoretically perform a lot faster than the Radeon HD 4670 512MB in general. (explain)

Radeon HD 6950		160000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 128000 (400%)

Texel Rate

The Radeon HD 6950 will be quite a bit (about 193%) better at texture filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 46400 (193%)

Pixel Rate

The Radeon HD 6950 should be quite a bit (more or less 327%) more effective at FSAA than the Radeon HD 4670 512MB, and also should be capable of handling higher screen resolutions better. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon HD 4670 512MB		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 max amount of data (in units of MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.