Radeon HD 7750 vs Radeon HD 7950 3GB

Intro

Compare those specifications to the Radeon HD 7950 3GB, which comes with GPU core speed of 800 MHz, and 3072 MB of GDDR5 RAM running at 1250 MHz through a 384-bit bus. It also features 1792 Stream Processors, 112 TAUs, and 32 ROPs.

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

Theoretically speaking, the Radeon HD 7950 3GB should perform a lot faster 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 is much (about 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

The Radeon HD 7950 3GB should be much (more or less 100%) better at anti-aliasing than the Radeon HD 7750, and will be capable of handling higher screen resolutions without losing too much performance. (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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.