GeForce GTX 660 vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this particular model. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce GTX 660		140 Watts
	Difference: 32 Watts (30%)

Memory Bandwidth

In theory, the GeForce GTX 660 should be a lot faster than the Radeon HD 6770 1GB overall. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 76992 (115%)

Texel Rate

The GeForce GTX 660 is quite a bit (more or less 118%) more effective at texture filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 42400 (118%)

Pixel Rate

The GeForce GTX 660 is much (approximately 63%) more effective at FSAA than the Radeon HD 6770 1GB, and also should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 9120 (63%)

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 megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total 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 processed in a second.

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