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Geforce GTX 670 vs Radeon HD 6870

Intro

The Geforce GTX 670 comes with clock speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1344 SPUs along with 112 TAUs and 32 ROPs.

Compare those specs to the Radeon HD 6870, which features a GPU core clock speed of 900 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 256-bit bus. It also features 1120 Stream Processors, 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

The Geforce GTX 670 should in theory perform a lot faster than the Radeon HD 6870 overall. (explain)

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

Texel Rate

The Geforce GTX 670 will be much (approximately 103%) more effective at texture filtering 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 the winner, though only just barely. (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 maximum amount of data (measured in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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