Radeon HD 3470 256MB vs Radeon HD 3650

Intro

Compare that to the Radeon HD 3650, which comes with core speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 memory. It features 120(24x5) SPUs as well as 8 Texture Address Units and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3470 256MB should be just a bit faster than the Radeon HD 3650 in general. (explain)

Radeon HD 3470 256MB		30400 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 4800 (19%)

Texel Rate

The Radeon HD 3650 is much (about 81%) more effective at texture filtering than the Radeon HD 3470 256MB. (explain)

Radeon HD 3650		5800 Mtexels/sec
Radeon HD 3470 256MB		3200 Mtexels/sec
	Difference: 2600 (81%)

Pixel Rate

The Radeon HD 3470 256MB will be a small bit (about 10%) more effective at full screen anti-aliasing than the Radeon HD 3650, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 3470 256MB		3200 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 300 (10%)

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 maximum amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.