GeForce GTX 660 vs Radeon HD 6770 1GB

Intro

Compare those specifications to the Radeon HD 6770 1GB, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory is set to run at a speed of 1050 MHz on this specific card. It features 800 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

The GeForce GTX 660 should theoretically perform quite a bit 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%) better 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

If running with lots of anti-aliasing is important to you, then the GeForce GTX 660 is superior to the Radeon HD 6770 1GB, by far. (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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.