GeForce GTX 260 vs Radeon HD 6770 1GB

Intro

Compare all that to the Radeon HD 6770 1GB, which comes with a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
GeForce GTX 260		182 Watts
	Difference: 74 Watts (69%)

Memory Bandwidth

In theory, the GeForce GTX 260 will be 67% quicker than the Radeon HD 6770 1GB in general, because of its greater bandwidth. (explain)

GeForce GTX 260		111888 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 44688 (67%)

Texel Rate

The GeForce GTX 260 should be a bit (more or less 2%) more effective at anisotropic filtering than the Radeon HD 6770 1GB. (explain)

GeForce GTX 260		36864 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 864 (2%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 260 is the winner, but not by far. (explain)

GeForce GTX 260		16128 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 1728 (12%)

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 (counted in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, it must 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.