Radeon HD 4670 512MB vs Radeon HD 6950 2GB

Intro

Compare those specifications to the Radeon HD 6950 2GB, which has GPU clock speed of 800 MHz, and 2048 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is comprised 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 4670 512MB		70 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 130 Watts (186%)

Memory Bandwidth

Performance-wise, the Radeon HD 6950 2GB should theoretically be a lot better than the Radeon HD 4670 512MB overall. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 128000 (400%)

Texel Rate

The Radeon HD 6950 2GB will be a lot (approximately 193%) more effective at texture filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 46400 (193%)

Pixel Rate

The Radeon HD 6950 2GB should be much (approximately 327%) better at anti-aliasing than the Radeon HD 4670 512MB, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6950 2GB		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 information (in units of megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling 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 can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 ability to get to the max fill rate.