Radeon HD 3690/3830 vs Radeon HD 6750 1GB

Intro

Compare those specs to the Radeon HD 6750 1GB, which comes with GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also features 720 Stream Processors, 36 Texture Address Units, 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 6750 1GB		86 Watts
	Difference: 11 Watts (15%)

Memory Bandwidth

In theory, the Radeon HD 6750 1GB should be 142% quicker than the Radeon HD 3690/3830 overall, due to its higher data rate. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 37504 (142%)

Texel Rate

The Radeon HD 6750 1GB should be quite a bit (about 144%) better at texture filtering than the Radeon HD 3690/3830. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 15412 (144%)

Pixel Rate

The Radeon HD 6750 1GB will be a little bit (approximately 9%) faster with regards to AA than the Radeon HD 3690/3830, and also will be able to handle higher screen resolutions better. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 3690/3830		10688 Mpixels/sec
	Difference: 912 (9%)

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 information (in units of MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.