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Radeon HD 5870 vs Radeon HD 6570 (OEM) 2GB

Intro

The Radeon HD 5870 has a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It features 1600(320x5) SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 6570 (OEM) 2GB, which features core speeds of 650 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 480 SPUs as well as 24 TAUs and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6570 (OEM) 2GB		50 Watts
Radeon HD 5870		188 Watts
	Difference: 138 Watts (276%)

Memory Bandwidth

In theory, the Radeon HD 5870 is 140% faster than the Radeon HD 6570 (OEM) 2GB in general, due to its higher data rate. (explain)

Radeon HD 5870		153600 MB/sec
Radeon HD 6570 (OEM) 2GB		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 5870 will be much (more or less 336%) better at AF than the Radeon HD 6570 (OEM) 2GB. (explain)

Radeon HD 5870		68000 Mtexels/sec
Radeon HD 6570 (OEM) 2GB		15600 Mtexels/sec
	Difference: 52400 (336%)

Pixel Rate

The Radeon HD 5870 is quite a bit (more or less 423%) better at full screen anti-aliasing than the Radeon HD 6570 (OEM) 2GB, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 5870		27200 Mpixels/sec
Radeon HD 6570 (OEM) 2GB		5200 Mpixels/sec
	Difference: 22000 (423%)

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.

Price Comparison

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Radeon HD 5870

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Radeon HD 6570 (OEM) 2GB

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Specifications

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Model	Radeon HD 5870	Radeon HD 6570 (OEM) 2GB
Manufacturer	AMD	AMD
Year	September 23, 2009	February 2011
Code Name	Cypress XT	Turks
Memory	1024 MB	1024 MB
Core Speed	850 MHz	650 MHz
Memory Speed	4800 MHz	4000 MHz
Power (Max TDP)	188 watts	50 watts
Bandwidth	153600 MB/sec	64000 MB/sec
Texel Rate	68000 Mtexels/sec	15600 Mtexels/sec
Pixel Rate	27200 Mpixels/sec	5200 Mpixels/sec
Unified Shaders	1600(320x5)	480
Texture Mapping Units	80	24
Render Output Units	32	8
Bus Type	GDDR5	GDDR5
Bus Width	256-bit	128-bit
Fab Process	40 nm	40 nm
Transistors	2154 million	715 million
Bus	PCIe 2.1 x16	PCIe 2.1 x16
DirectX Version	DirectX 11	DirectX 11
OpenGL Version	OpenGL 3.2	OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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