Radeon HD 5570 vs Radeon HD 6990

Intro

Compare those specs to the Radeon HD 6990, which makes use of a 40 nm design. AMD has clocked the core speed at 830 MHz. The GDDR5 memory works at a frequency of 1250 MHz on this card. It features 1536 SPUs as well as 96 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 6990		375 Watts
	Difference: 332 Watts (772%)

Memory Bandwidth

The Radeon HD 6990, in theory, should perform a lot faster than the Radeon HD 5570 overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 291200 (1011%)

Texel Rate

The Radeon HD 6990 will be much (about 1126%) more effective at AF than the Radeon HD 5570. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 146360 (1126%)

Pixel Rate

The Radeon HD 6990 is a lot (approximately 922%) faster with regards to AA than the Radeon HD 5570, and should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 47920 (922%)

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 max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of 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 one second.

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