Radeon HD 5750 1GB vs Radeon HD 6950 2GB

Intro

Compare those specifications to the Radeon HD 6950 2GB, which has a clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It features 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 5750 1GB		86 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 114 Watts (133%)

Memory Bandwidth

The Radeon HD 6950 2GB, in theory, should be much faster than the Radeon HD 5750 1GB overall. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 86400 (117%)

Texel Rate

The Radeon HD 6950 2GB is quite a bit (about 179%) better at anisotropic filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 45200 (179%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6950 2GB is superior to the Radeon HD 5750 1GB, by far. (explain)

Radeon HD 6950 2GB		25600 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 14400 (129%)

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 information (measured in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a 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 - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.