Radeon HD 3650 256MB vs Radeon HD 3690/3830

Intro

Compare those specifications to the Radeon HD 3690/3830, which makes use of a 55 nm design. AMD has clocked the core frequency at 668 MHz. The GDDR3 RAM works at a speed of 828 MHz on this particular card. It features 320(64x5) SPUs along with 16 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 3650 256MB		78 Watts
	Difference: 3 Watts (4%)

Memory Bandwidth

In theory, the Radeon HD 3690/3830 should perform just a bit faster than the Radeon HD 3650 256MB in general. (explain)

Radeon HD 3690/3830		26496 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 896 (4%)

Texel Rate

The Radeon HD 3690/3830 will be much (more or less 84%) better at texture filtering than the Radeon HD 3650 256MB. (explain)

Radeon HD 3690/3830		10688 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 4888 (84%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 3690/3830 is a better choice, by far. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon HD 3650 256MB		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 information (measured in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 once 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs 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 also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.