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Geforce GTX 680 vs Radeon HD 5870

Intro

The Geforce GTX 680 uses a 28 nm design. nVidia has set the core speed at 1006 MHz. The GDDR5 RAM works at a speed of 1502 MHz on this model. It features 1536 SPUs as well as 128 Texture Address Units and 32 ROPs.

Compare those specs to the Radeon HD 5870, which features GPU clock speed of 850 MHz, and 1024 MB of GDDR5 RAM set to run at 1200 MHz through a 256-bit bus. It also features 1600(320x5) SPUs, 80 Texture Address Units, 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

In theory, the Geforce GTX 680 will be 25% faster than the Radeon HD 5870 overall, due to its higher data rate. (explain)

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

Texel Rate

The Geforce GTX 680 will be much (more or less 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 using a high screen resolution is important to you, then the Geforce GTX 680 is superior to the Radeon HD 5870, but only just. (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

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Geforce GTX 680

Amazon.com

Radeon HD 5870

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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