GeForce GTX Titan vs Radeon HD 7950 3GB

Intro

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

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the GeForce GTX Titan should in theory be a small bit better than the Radeon HD 7950 3GB overall. (explain)

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

Texel Rate

The GeForce GTX Titan is much (about 109%) more effective at texture filtering than the Radeon HD 7950 3GB. (explain)

GeForce GTX Titan		187488 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 97888 (109%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX Titan is a better choice, by far. (explain)

GeForce GTX Titan		40176 Mpixels/sec
Radeon HD 7950 3GB		25600 Mpixels/sec
	Difference: 14576 (57%)

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 over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling 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 that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka 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 bandwidth is, the lower the potential to get to the maximum fill rate.