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Radeon HD 3870 512MB vs Radeon HD 4670 1GB
Intro
The Radeon HD 3870 512MB comes with a core clock frequency of 775 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 Raster Operation Units.Compare all of that to the Radeon HD 4670 1GB, which comes with GPU clock speed of 750 MHz, and 1024 MB of GDDR4/GDDR3/DDR3/DDR2 memory running at 1100 MHz through a 128-bit bus. It also features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4670 1GB |
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70 Watts |
| Radeon HD 3870 512MB |
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106 Watts |
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Memory Bandwidth
In theory, the Radeon HD 3870 512MB should be much faster than the Radeon HD 4670 1GB in general. (explain)
| Radeon HD 3870 512MB |
|
57600 MB/sec |
| Radeon HD 4670 1GB |
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35200 MB/sec |
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Texel Rate
The Radeon HD 4670 1GB is quite a bit (approximately 94%) faster with regards to texture filtering than the Radeon HD 3870 512MB. (explain)| Radeon HD 4670 1GB |
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24000 Mtexels/sec |
| Radeon HD 3870 512MB |
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12400 Mtexels/sec |
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Pixel Rate
If running with lots of anti-aliasing is important to you, then the Radeon HD 3870 512MB is a better choice, by far. (explain)| Radeon HD 3870 512MB |
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12400 Mpixels/sec |
| Radeon HD 4670 1GB |
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6000 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
Radeon HD 3870 512MBAmazon.com
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Radeon HD 4670 1GBAmazon.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 512MB | Radeon HD 4670 1GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Nov 19, 2007 | Sep 10, 2008 |
| Code Name | RV670 XT | RV730 XT |
| Memory | 512 MB | 1024 MB |
| Core Speed | 775 MHz | 750 MHz |
| Memory Speed | 1800 MHz | 2200 MHz |
| Power (Max TDP) | 106 watts | 70 watts |
| Bandwidth | 57600 MB/sec | 35200 MB/sec |
| Texel Rate | 12400 Mtexels/sec | 24000 Mtexels/sec |
| Pixel Rate | 12400 Mpixels/sec | 6000 Mpixels/sec |
| Unified Shaders | 320(64x5) | 320(64x5) |
| Texture Mapping Units | 16 | 32 |
| Render Output Units | 16 | 8 |
| Bus Type | GDDR3 | GDDR4/GDDR3/DDR3/DDR2 |
| Bus Width | 256-bit | 128-bit |
| Fab Process | 55 nm | 55 nm |
| Transistors | (Unknown) million | 514 million |
| Bus | PCIe 2.0 x16/AGP 8x | PCIe 2.0 x16, AGP 8x |
| DirectX Version | DirectX 10.1 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.
Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.
Radeon HD 3870 512MBAmazon.com
Check prices at:
|
Radeon HD 4670 1GBAmazon.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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