Geforce GTX 780 vs Radeon HD 7950 3GB

Intro

Compare those specs to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific model. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB		200 Watts
Geforce GTX 780		250 Watts
	Difference: 50 Watts (25%)

Memory Bandwidth

In theory, the Geforce GTX 780 should be 20% faster than the Radeon HD 7950 3GB in general, because of its greater bandwidth. (explain)

Geforce GTX 780		288384 MB/sec
Radeon HD 7950 3GB		240000 MB/sec
	Difference: 48384 (20%)

Texel Rate

The Geforce GTX 780 should be much (approximately 85%) faster with regards to texture filtering than the Radeon HD 7950 3GB. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 76096 (85%)

Pixel Rate

The Geforce GTX 780 will be much (more or less 62%) faster with regards to AA than the Radeon HD 7950 3GB, and will be able to handle higher screen resolutions more effectively. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon HD 7950 3GB		25600 Mpixels/sec
	Difference: 15824 (62%)

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 megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.