GeForce GTX 660 Ti vs Radeon HD 7950 3GB

Intro

Compare all of that 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 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti		150 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 50 Watts (33%)

Memory Bandwidth

In theory, the Radeon HD 7950 3GB will be 67% faster than the GeForce GTX 660 Ti in general, due to its higher bandwidth. (explain)

Radeon HD 7950 3GB		240000 MB/sec
GeForce GTX 660 Ti		144000 MB/sec
	Difference: 96000 (67%)

Texel Rate

The GeForce GTX 660 Ti should be a small bit (approximately 14%) better at AF than the Radeon HD 7950 3GB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 12880 (14%)

Pixel Rate

The Radeon HD 7950 3GB will be a little bit (approximately 17%) better at FSAA than the GeForce GTX 660 Ti, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
GeForce GTX 660 Ti		21960 Mpixels/sec
	Difference: 3640 (17%)

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 largest amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.