Radeon HD 3650 256MB vs Radeon HD 5570

Intro

Compare those specifications to the Radeon HD 5570, which has a core clock speed of 650 MHz and a DDR3 memory frequency of 900 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is made up of 400(80x5) SPUs, 20 Texture Address Units, and 8 ROPs.

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

Theoretically, the Radeon HD 5570 should be just a bit faster than 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 much (more or less 124%) faster with regards to 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

The Radeon HD 5570 will be quite a bit (more or less 79%) more effective at AA than the Radeon HD 3650 256MB, and should be able to handle higher screen resolutions without slowing down too much. (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: Bandwidth is the max amount of information (in units of 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 speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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