Radeon HD 5750 1GB vs Radeon HD 7950 3GB

Intro

Compare those specs to the Radeon HD 7950 3GB, which features GPU core speed of 800 MHz, and 3072 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also features 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 5750 1GB		86 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 114 Watts (133%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 3GB should be 226% quicker than the Radeon HD 5750 1GB in general, because of its higher bandwidth. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 166400 (226%)

Texel Rate

The Radeon HD 7950 3GB should be a lot (about 256%) more effective at AF than the Radeon HD 5750 1GB. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 64400 (256%)

Pixel Rate

The Radeon HD 7950 3GB is much (approximately 129%) better at anti-aliasing than the Radeon HD 5750 1GB, and should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 7950 3GB		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: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.