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Geforce GTX 670 vs Radeon HD 6870
Intro
The Geforce GTX 670 makes use of a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this card. It features 1344 SPUs as well as 112 Texture Address Units and 32 ROPs.Compare all of that to the Radeon HD 6870, which features a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It features 1120 SPUs, 56 Texture Address Units, and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6870 |
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151 Watts |
| Geforce GTX 670 |
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170 Watts |
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Memory Bandwidth
The Geforce GTX 670 should theoretically perform a lot faster than the Radeon HD 6870 overall. (explain)
| Geforce GTX 670 |
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192000 MB/sec |
| Radeon HD 6870 |
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134400 MB/sec |
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Texel Rate
The Geforce GTX 670 is a lot (approximately 103%) more effective at anisotropic filtering than the Radeon HD 6870. (explain)| Geforce GTX 670 |
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102480 Mtexels/sec |
| Radeon HD 6870 |
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50400 Mtexels/sec |
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Pixel Rate
If running with a high resolution is important to you, then the Geforce GTX 670 is the winner, though not by far. (explain)| Geforce GTX 670 |
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29280 Mpixels/sec |
| Radeon HD 6870 |
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28800 Mpixels/sec |
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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 670Amazon.com
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Radeon HD 6870Amazon.com
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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
| 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 information (counted in megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.
Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.
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