Radeon HD 6570 (OEM) 2GB vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which has a core clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It features 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6570 (OEM) 2GB		50 Watts
Radeon HD 6990		375 Watts
	Difference: 325 Watts (650%)

Memory Bandwidth

The Radeon HD 6990, in theory, should be a lot faster than the Radeon HD 6570 (OEM) 2GB overall. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 6570 (OEM) 2GB		64000 MB/sec
	Difference: 256000 (400%)

Texel Rate

The Radeon HD 6990 will be quite a bit (about 922%) more effective at anisotropic filtering than the Radeon HD 6570 (OEM) 2GB. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
	Difference: 143760 (922%)

Pixel Rate

The Radeon HD 6990 is a lot (about 922%) better at FSAA than the Radeon HD 6570 (OEM) 2GB, and capable of handling higher resolutions better. (explain)

Radeon HD 6990		53120 Mpixels/sec
Radeon HD 6570 (OEM) 2GB		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 largest amount of data (in units of MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher 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 that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.