GeForce GTX 580 3GB vs Radeon HD 6770

Intro

Compare all of that to the Radeon HD 6770, which uses a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this specific card. It features 800 SPUs as well as 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		108 Watts
GeForce GTX 580 3GB		244 Watts
	Difference: 136 Watts (126%)

Memory Bandwidth

The GeForce GTX 580 3GB, in theory, should perform much faster than the Radeon HD 6770 overall. (explain)

GeForce GTX 580 3GB		192384 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 125184 (186%)

Texel Rate

The GeForce GTX 580 3GB is much (approximately 37%) better at anisotropic filtering than the Radeon HD 6770. (explain)

GeForce GTX 580 3GB		49408 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 13408 (37%)

Pixel Rate

The GeForce GTX 580 3GB will be a lot (more or less 157%) more effective at anti-aliasing than the Radeon HD 6770, and should be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 580 3GB		37056 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 22656 (157%)

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 information (measured in MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.