Radeon HD 3650 256MB vs Radeon HD 5570

Intro

Compare those specs to the Radeon HD 5570, which features GPU core speed of 650 MHz, and 512 MB of DDR3 RAM running at 900 MHz through a 128-bit bus. It also is made up of 400(80x5) SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 3650 256MB		78 Watts
	Difference: 35 Watts (81%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5570 should in theory be just a bit superior to the Radeon HD 3650 256MB in general. (explain)

Radeon HD 5570		28800 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 3200 (13%)

Texel Rate

The Radeon HD 5570 is quite a bit (more or less 124%) more effective at anisotropic filtering than the Radeon HD 3650 256MB. (explain)

Radeon HD 5570		13000 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 7200 (124%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 5570 is the winner, and very much so. (explain)

Radeon HD 5570		5200 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 2300 (79%)

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 max amount of information (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's 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 amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.