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Geforce GTX 680 vs Radeon HD 5870


Intro

The Geforce GTX 680 features a GPU core clock speed of 1006 MHz, and the 2048 MB of GDDR5 RAM runs at 1502 MHz through a 256-bit bus. It also features 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon HD 5870, which has a clock speed of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 256-bit memory bus, and makes use of a 40 nm design. It features 1600(320x5) SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Geforce GTX 680 195 Watts
Difference: 7 Watts (4%)

Memory Bandwidth

The Geforce GTX 680, in theory, should be much faster than the Radeon HD 5870 in general. (explain)

Geforce GTX 680 192256 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 38656 (25%)

Texel Rate

The Geforce GTX 680 will be a lot (approximately 89%) better at texture filtering than the Radeon HD 5870. (explain)

Geforce GTX 680 128768 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 60768 (89%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 680 is the winner, though not by far. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 5870 27200 Mpixels/sec
Difference: 4992 (18%)

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

Geforce GTX 680

Radeon HD 5870

Specifications

Display Specifications

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Model Geforce GTX 680 Radeon HD 5870
Manufacturer nVidia AMD
Year March 2012 September 23, 2009
Code Name GK104 Cypress XT
Memory 2048 MB 1024 MB
Core Speed 1006 MHz 850 MHz
Memory Speed 6008 MHz 4800 MHz
Power (Max TDP) 195 watts 188 watts
Bandwidth 192256 MB/sec 153600 MB/sec
Texel Rate 128768 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 1536 1600(320x5)
Texture Mapping Units 128 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 3540 million 2154 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 3.2

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 are processed in one second. This figure is calculated by multiplying the total texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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 bandwidth is, the lower the potential to get to the max fill rate.

Geforce GTX 680

Radeon HD 5870

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