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Geforce GTX 670 vs Radeon HD 6870

Intro

The Geforce GTX 670 uses a 28 nm design. nVidia has clocked the core speed at 915 MHz. The GDDR5 memory is set to run at a frequency of 1500 MHz on this particular model. It features 1344 SPUs as well as 112 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon HD 6870, which has core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Geforce GTX 670 170 Watts
Difference: 19 Watts (13%)

Memory Bandwidth

In theory, the Geforce GTX 670 is 43% faster than the Radeon HD 6870 overall, due to its higher bandwidth. (explain)

Geforce GTX 670 192000 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 57600 (43%)

Texel Rate

The Geforce GTX 670 is quite a bit (more or less 103%) faster with regards to AF than the Radeon HD 6870. (explain)

Geforce GTX 670 102480 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 52080 (103%)

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 670 is a better choice, but it probably won't make a huge difference. (explain)

Geforce GTX 670 29280 Mpixels/sec
Radeon HD 6870 28800 Mpixels/sec
Difference: 480 (2%)

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 670

Amazon.com

Radeon HD 6870

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 670 Radeon HD 6870
Manufacturer nVidia AMD
Year May 2012 October 2010
Code Name GK104 Barts XT
Memory 2048 MB 1024 MB
Core Speed 915 MHz 900 MHz
Memory Speed 6000 MHz 4200 MHz
Power (Max TDP) 170 watts 151 watts
Bandwidth 192000 MB/sec 134400 MB/sec
Texel Rate 102480 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 29280 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 1344 1120
Texture Mapping Units 112 56
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 3540 million 1700 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 are processed in one second. This is calculated by multiplying the total number 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one 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 - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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