Radeon HD 3650 vs Radeon HD 3690/3830

Intro

Compare that to the Radeon HD 3690/3830, which comes with core clock speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 RAM. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

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

In theory, the Radeon HD 3690/3830 is 4% quicker than the Radeon HD 3650 overall, because of its higher data rate. (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 quite a bit (more or less 84%) more effective at AF 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 will be a lot (more or less 269%) better at full screen anti-aliasing than the Radeon HD 3650, and should be able to handle higher resolutions better. (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 maximum amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.