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Radeon HD 3870 X2 512MB vs Radeon HD 6750
Intro
The Radeon HD 3870 X2 512MB has a clock frequency of 825 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 ROPs.Compare those specs to the Radeon HD 6750, which features a GPU core clock speed of 725 MHz, and 512 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is comprised of 720 Stream Processors, 36 TAUs, and 16 ROPs.
Power Usage and Theoretical Benchmarks
Memory Bandwidth
The Radeon HD 3870 X2 512MB, in theory, should perform a lot faster than the Radeon HD 6750 overall. (explain)
| Radeon HD 3870 X2 512MB |
|
115200 MB/sec |
| Radeon HD 6750 |
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64000 MB/sec |
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Texel Rate
The Radeon HD 3870 X2 512MB is just a bit (approximately 1%) better at AF than the Radeon HD 6750. (explain)| Radeon HD 3870 X2 512MB |
|
26400 Mtexels/sec |
| Radeon HD 6750 |
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26100 Mtexels/sec |
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Pixel Rate
The Radeon HD 3870 X2 512MB is a lot (about 128%) faster with regards to anti-aliasing than the Radeon HD 6750, and capable of handling higher screen resolutions while still performing well. (explain)| Radeon HD 3870 X2 512MB |
|
26400 Mpixels/sec |
| Radeon HD 6750 |
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11600 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 HD 6750Amazon.com
Check prices at:
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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 HD 6750 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jan 28, 2008 | January 2011 |
| Code Name | R680 | Juniper Pro |
| Memory | 512 MB (x2) | 512 MB |
| Core Speed | 825 MHz (x2) | 725 MHz |
| Memory Speed | 1800 MHz (x2) | 4000 MHz |
| Power (Max TDP) | (Unknown) watts | 86 watts |
| Bandwidth | 115200 MB/sec | 64000 MB/sec |
| Texel Rate | 26400 Mtexels/sec | 26100 Mtexels/sec |
| Pixel Rate | 26400 Mpixels/sec | 11600 Mpixels/sec |
| Unified Shaders | 320(64x5) (x2) | 720 |
| Texture Mapping Units | 16 (x2) | 36 |
| Render Output Units | 16 (x2) | 16 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 256-bit (x2) | 128-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | (Unknown) million | 1040 million |
| Bus | PCIe 2.0 x16/(internal PCIe 1.1 x16) | PCIe x16 |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.0 |
Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that can be applied per second. This number is worked out 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 applied in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.
Radeon HD 3870 X2 512MBAmazon.com
Check prices at:
|
Radeon HD 6750Amazon.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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