Radeon HD 6750 1GB vs Radeon HD 7950 3GB

Intro

Compare those specifications to the Radeon HD 7950 3GB, which features a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 384-bit memory bus, and makes use of a 28 nm design. It is comprised of 1792 SPUs, 112 TAUs, 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

In theory, the Radeon HD 7950 3GB will be 275% faster than the Radeon HD 6750 1GB in general, due to its higher data rate. (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 a lot (approximately 243%) faster with regards to 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 lots of anti-aliasing 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 max amount of information (measured in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed 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 better 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 video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.