Radeon HD 7750 vs Radeon HD 7950 3GB

Intro

Compare those specifications to the Radeon HD 7950 3GB, which features a GPU core clock speed of 800 MHz, and 3072 MB of GDDR5 memory running at 1250 MHz through a 384-bit bus. It also is made up of 1792 SPUs, 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 7750		55 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 145 Watts (264%)

Memory Bandwidth

Performance-wise, the Radeon HD 7950 3GB should theoretically be a lot better than the Radeon HD 7750 in general. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon HD 7750		72000 MB/sec
	Difference: 168000 (233%)

Texel Rate

The Radeon HD 7950 3GB will be quite a bit (approximately 250%) better at texture filtering than the Radeon HD 7750. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon HD 7750		25600 Mtexels/sec
	Difference: 64000 (250%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7950 3GB is a better choice, by far. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon HD 7750		12800 Mpixels/sec
	Difference: 12800 (100%)

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 data (measured in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could 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 colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.