GeForce GTX 660 Ti vs Radeon HD 7950 3GB

Intro

Compare all of that to the Radeon HD 7950 3GB, which has a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It is made up of 1792 SPUs, 112 TAUs, and 32 ROPs.

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 should perform a lot faster than the GeForce GTX 660 Ti overall. (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 is just a bit (about 14%) more effective at anisotropic filtering 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 should be a bit (approximately 17%) more effective at FSAA than the GeForce GTX 660 Ti, and capable of handling higher screen resolutions without slowing down too much. (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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.