Radeon HD 4870 X2 vs Radeon HD 5570

Intro

Compare all of that to the Radeon HD 5570, which features a core clock frequency of 650 MHz and a DDR3 memory frequency of 900 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is comprised of 400(80x5) SPUs, 20 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 307 Watts (714%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 X2 should in theory be quite a bit better than the Radeon HD 5570 overall. (explain)

Radeon HD 4870 X2		230400 MB/sec
Radeon HD 5570		28800 MB/sec
	Difference: 201600 (700%)

Texel Rate

The Radeon HD 4870 X2 is quite a bit (about 362%) more effective at AF than the Radeon HD 5570. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
Radeon HD 5570		13000 Mtexels/sec
	Difference: 47000 (362%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4870 X2 is superior to the Radeon HD 5570, and very much so. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
Radeon HD 5570		5200 Mpixels/sec
	Difference: 18800 (362%)

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 largest amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.