GeForce GTX 660 vs Radeon HD 5670

Intro

Compare those specifications to the Radeon HD 5670, which comes with a core clock speed of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It features 400(80x5) SPUs, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
GeForce GTX 660		140 Watts
	Difference: 79 Watts (130%)

Memory Bandwidth

In theory, the GeForce GTX 660 will be 125% faster than the Radeon HD 5670 in general, due to its greater data rate. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 80192 (125%)

Texel Rate

The GeForce GTX 660 will be quite a bit (about 406%) more effective at AF than the Radeon HD 5670. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 62900 (406%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 660 is superior to the Radeon HD 5670, by a large margin. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 17320 (279%)

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 MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.