Radeon HD 6750 1GB vs Radeon HD 7950 3GB

Intro

Compare all of that to the Radeon HD 7950 3GB, which features GPU clock speed of 800 MHz, and 3072 MB of GDDR5 memory set to run at 1250 MHz through a 384-bit bus. It also features 1792 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 114 Watts (133%)

Memory Bandwidth

The Radeon HD 7950 3GB, in theory, should perform much faster than the Radeon HD 6750 1GB overall. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 176000 (275%)

Texel Rate

The Radeon HD 7950 3GB should be much (more or less 243%) more effective at AF than the Radeon HD 6750 1GB. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 63500 (243%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7950 3GB is a better choice, by a large margin. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 14000 (121%)

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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.