GeForce 8800 GTX vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which comes with core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 memory. It features 800 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
GeForce 8800 GTX		155 Watts
	Difference: 47 Watts (44%)

Memory Bandwidth

The GeForce 8800 GTX should in theory be much faster than the Radeon HD 6770 overall. (explain)

GeForce 8800 GTX		86400 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 19200 (29%)

Texel Rate

The GeForce 8800 GTX is a small bit (more or less 2%) more effective at anisotropic filtering than the Radeon HD 6770. (explain)

GeForce 8800 GTX		36800 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 800 (2%)

Pixel Rate

The Radeon HD 6770 should be a little bit (more or less 4%) more effective at AA than the GeForce 8800 GTX, and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce 8800 GTX		13800 Mpixels/sec
	Difference: 600 (4%)

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 data (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate 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 drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.