Radeon HD 5670 vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which comes with GPU clock speed of 830 MHz, and 2048 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also features 1536 Stream Processors, 96 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 6990		375 Watts
	Difference: 314 Watts (515%)

Memory Bandwidth

Theoretically, the Radeon HD 6990 should perform a lot faster than the Radeon HD 5670 in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 256000 (400%)

Texel Rate

The Radeon HD 6990 will be much (about 928%) better at AF than the Radeon HD 5670. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 143860 (928%)

Pixel Rate

The Radeon HD 6990 will be quite a bit (about 757%) more effective at anti-aliasing than the Radeon HD 5670, and also able to handle higher resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 46920 (757%)

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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.