Radeon HD 3690/3830 vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which comes with clock speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon HD 3690/3830		75 Watts
	Difference: 20 Watts (36%)

Memory Bandwidth

Performance-wise, the Radeon HD 3690/3830 should theoretically be a little bit superior to the Radeon HD 4650 1GB in general. (explain)

Radeon HD 3690/3830		26496 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 4096 (18%)

Texel Rate

The Radeon HD 4650 1GB is much (more or less 80%) more effective at AF than the Radeon HD 3690/3830. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 8512 (80%)

Pixel Rate

The Radeon HD 3690/3830 is a lot (approximately 123%) more effective at anti-aliasing than the Radeon HD 4650 1GB, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 5888 (123%)

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 largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.