GeForce GTX 660 Ti vs Radeon HD 6770 1GB

Intro

Compare all of that to the Radeon HD 6770 1GB, which features a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 42 Watts (39%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should in theory be much superior to the Radeon HD 6770 1GB in general. (explain)

GeForce GTX 660 Ti		144000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 76800 (114%)

Texel Rate

The GeForce GTX 660 Ti will be a lot (more or less 185%) more effective at AF than the Radeon HD 6770 1GB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 66480 (185%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 660 Ti is superior to the Radeon HD 6770 1GB, and very much so. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 7560 (53%)

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 max amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core 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 one second.

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