Radeon HD 3650 vs Radeon HD 3690/3830

Intro

Compare all that to the Radeon HD 3690/3830, which uses a 55 nm design. AMD has set the core speed at 668 MHz. The GDDR3 RAM works at a frequency of 828 MHz on this model. It features 320(64x5) SPUs along with 16 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 3650		78 Watts
	Difference: 3 Watts (4%)

Memory Bandwidth

As far as performance goes, the Radeon HD 3690/3830 should theoretically be a bit better than the Radeon HD 3650 in general. (explain)

Radeon HD 3690/3830		26496 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 896 (4%)

Texel Rate

The Radeon HD 3690/3830 is much (more or less 84%) more effective at anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 3690/3830		10688 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 4888 (84%)

Pixel Rate

The Radeon HD 3690/3830 should be much (approximately 269%) faster with regards to AA than the Radeon HD 3650, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 7788 (269%)

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 megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.