Geforce GTX 670 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 speed at 800 MHz. The GDDR5 memory works at a speed of 1250 MHz on this 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)

Geforce GTX 670		170 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 30 Watts (18%)

Memory Bandwidth

Theoretically, the Radeon HD 7950 3GB should be a lot faster than the Geforce GTX 670 in general. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Geforce GTX 670		192000 MB/sec
	Difference: 48000 (25%)

Texel Rate

The Geforce GTX 670 will be a small bit (approximately 14%) more effective at anisotropic filtering than the Radeon HD 7950 3GB. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 12880 (14%)

Pixel Rate

The Geforce GTX 670 will be a bit (more or less 14%) faster with regards to AA than the Radeon HD 7950 3GB, and able to handle higher resolutions better. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon HD 7950 3GB		25600 Mpixels/sec
	Difference: 3680 (14%)

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 (counted in MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 in one second. This is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.