Radeon HD 3650 256MB vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which features clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
Radeon HD 6990		375 Watts
	Difference: 297 Watts (381%)

Memory Bandwidth

The Radeon HD 6990 should theoretically be quite a bit faster than the Radeon HD 3650 256MB in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 294400 (1150%)

Texel Rate

The Radeon HD 6990 will be much (more or less 2648%) more effective at AF than the Radeon HD 3650 256MB. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 153560 (2648%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6990 is the winner, by a large margin. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 50220 (1732%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 amount of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends 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.