Radeon HD 3690/3830 vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which features clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3690/3830		75 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 33 Watts (44%)

Memory Bandwidth

The Radeon HD 6770 1GB should in theory perform quite a bit faster than the Radeon HD 3690/3830 overall. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 40704 (154%)

Texel Rate

The Radeon HD 6770 1GB should be a lot (approximately 237%) faster with regards to AF than the Radeon HD 3690/3830. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 25312 (237%)

Pixel Rate

The Radeon HD 6770 1GB is much (approximately 35%) better at full screen anti-aliasing than the Radeon HD 3690/3830, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 3690/3830		10688 Mpixels/sec
	Difference: 3712 (35%)

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 max amount of information (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.