GeForce GTX 660 Ti vs Radeon HD 6770 1GB

Intro

Compare that to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this model. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator 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

Performance-wise, the GeForce GTX 660 Ti should in theory be quite a bit better than the Radeon HD 6770 1GB overall. (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 much (about 185%) better at texture filtering 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

The GeForce GTX 660 Ti will be much (more or less 53%) faster with regards to full screen anti-aliasing than the Radeon HD 6770 1GB, and also will be able to handle higher screen resolutions while still performing well. (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: Bandwidth is the max amount of information (in units of MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics 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 number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.