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Radeon HD 3870 X2 512MB vs Radeon R7 250
Intro
The Radeon HD 3870 X2 512MB features a core clock frequency of 825 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.Compare that to the Radeon R7 250, which comes with a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1150 MHz through a 128-bit bus. It also features 384 Stream Processors, 24 Texture Address Units, and 8 ROPs.
Power Usage and Theoretical Benchmarks
Memory Bandwidth
In theory, the Radeon HD 3870 X2 512MB will be 57% quicker than the Radeon R7 250 in general, because of its higher data rate. (explain)
| Radeon HD 3870 X2 512MB |
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115200 MB/sec |
| Radeon R7 250 |
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73600 MB/sec |
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Texel Rate
The Radeon HD 3870 X2 512MB will be a bit (more or less 10%) more effective at texture filtering than the Radeon R7 250. (explain)| Radeon HD 3870 X2 512MB |
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26400 Mtexels/sec |
| Radeon R7 250 |
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24000 Mtexels/sec |
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Pixel Rate
If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 X2 512MB is a better choice, by a large margin. (explain)| Radeon HD 3870 X2 512MB |
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26400 Mpixels/sec |
| Radeon R7 250 |
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8000 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.
One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.
Price Comparison
Radeon HD 3870 X2 512MBAmazon.com
Check prices at:
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Radeon R7 250Amazon.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 | Radeon HD 3870 X2 512MB | Radeon R7 250 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jan 28, 2008 | October 2013 |
| Code Name | R680 | Oland XT |
| Memory | 512 MB (x2) | 1024 MB |
| Core Speed | 825 MHz (x2) | 1000 MHz |
| Memory Speed | 1800 MHz (x2) | 4600 MHz |
| Power (Max TDP) | (Unknown) watts | 65 watts |
| Bandwidth | 115200 MB/sec | 73600 MB/sec |
| Texel Rate | 26400 Mtexels/sec | 24000 Mtexels/sec |
| Pixel Rate | 26400 Mpixels/sec | 8000 Mpixels/sec |
| Unified Shaders | 320(64x5) (x2) | 384 |
| Texture Mapping Units | 16 (x2) | 24 |
| Render Output Units | 16 (x2) | 8 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 256-bit (x2) | 128-bit |
| Fab Process | 55 nm | 28 nm |
| Transistors | (Unknown) million | 1040 million |
| Bus | PCIe 2.0 x16/(internal PCIe 1.1 x16) | PCIe 3.0 x16 |
| DirectX Version | DirectX 10.1 | DirectX 11.2 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.3 |
Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 applied in one second. This is worked out by multiplying the total amount of texture units by the core clock 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 in a second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on 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 ability to get to the max fill rate.
Radeon HD 3870 X2 512MBAmazon.com
Check prices at:
|
Radeon R7 250Amazon.com
Check prices at:
|
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.
|
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