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Radeon HD 4870 1GB vs Radeon HD 7950 3GB
Intro
The Radeon HD 4870 1GB features a core clock speed of 750 MHz and a GDDR5 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 800(160x5) SPUs, 40 TAUs, and 16 ROPs.Compare those specifications to the Radeon HD 7950 3GB, which has a core clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4870 1GB |
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150 Watts |
| Radeon HD 7950 3GB |
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200 Watts |
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Memory Bandwidth
Theoretically speaking, the Radeon HD 7950 3GB should perform much faster than the Radeon HD 4870 1GB in general. (explain)
| Radeon HD 7950 3GB |
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240000 MB/sec |
| Radeon HD 4870 1GB |
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115200 MB/sec |
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Texel Rate
The Radeon HD 7950 3GB is a lot (more or less 199%) more effective at AF than the Radeon HD 4870 1GB. (explain)| Radeon HD 7950 3GB |
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89600 Mtexels/sec |
| Radeon HD 4870 1GB |
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30000 Mtexels/sec |
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Pixel Rate
The Radeon HD 7950 3GB will be much (more or less 113%) more effective at FSAA than the Radeon HD 4870 1GB, and also able to handle higher screen resolutions without losing too much performance. (explain)| Radeon HD 7950 3GB |
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25600 Mpixels/sec |
| Radeon HD 4870 1GB |
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12000 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 4870 1GBAmazon.com
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Radeon HD 7950 3GBAmazon.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 4870 1GB | Radeon HD 7950 3GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jun 25, 2008 | January 2012 |
| Code Name | RV770 XT | Tahiti Pro |
| Memory | 1024 MB | 3072 MB |
| Core Speed | 750 MHz | 800 MHz |
| Memory Speed | 3600 MHz | 5000 MHz |
| Power (Max TDP) | 150 watts | 200 watts |
| Bandwidth | 115200 MB/sec | 240000 MB/sec |
| Texel Rate | 30000 Mtexels/sec | 89600 Mtexels/sec |
| Pixel Rate | 12000 Mpixels/sec | 25600 Mpixels/sec |
| Unified Shaders | 800(160x5) | 1792 |
| Texture Mapping Units | 40 | 112 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 384-bit |
| Fab Process | 55 nm | 28 nm |
| Transistors | 956 million | 4313 million |
| Bus | PCIe 2.0 x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 10.1 | DirectX 11.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.2 |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.
Radeon HD 4870 1GBAmazon.com
Check prices at:
|
Radeon HD 7950 3GBAmazon.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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