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Radeon HD 4870 512MB vs Radeon HD 7750
Intro
The Radeon HD 4870 512MB comes with a core clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.Compare those specifications to the Radeon HD 7750, which features clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7750 |
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55 Watts |
| Radeon HD 4870 512MB |
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150 Watts |
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Memory Bandwidth
The Radeon HD 4870 512MB, in theory, should perform quite a bit faster than the Radeon HD 7750 overall. (explain)
| Radeon HD 4870 512MB |
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115200 MB/sec |
| Radeon HD 7750 |
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72000 MB/sec |
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Texel Rate
The Radeon HD 4870 512MB will be a little bit (approximately 17%) better at AF than the Radeon HD 7750. (explain)| Radeon HD 4870 512MB |
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30000 Mtexels/sec |
| Radeon HD 7750 |
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25600 Mtexels/sec |
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Pixel Rate
If running with high levels of AA is important to you, then the Radeon HD 7750 is superior to the Radeon HD 4870 512MB, not by a very large margin though. (explain)| Radeon HD 7750 |
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12800 Mpixels/sec |
| Radeon HD 4870 512MB |
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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 512MBAmazon.com
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Radeon HD 7750Amazon.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 512MB | Radeon HD 7750 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jun 25, 2008 | February 2012 |
| Code Name | RV770 XT | Cape Verde Pro |
| Memory | 512 MB | 1024 MB |
| Core Speed | 750 MHz | 800 MHz |
| Memory Speed | 3600 MHz | 4500 MHz |
| Power (Max TDP) | 150 watts | 55 watts |
| Bandwidth | 115200 MB/sec | 72000 MB/sec |
| Texel Rate | 30000 Mtexels/sec | 25600 Mtexels/sec |
| Pixel Rate | 12000 Mpixels/sec | 12800 Mpixels/sec |
| Unified Shaders | 800(160x5) | 512 |
| Texture Mapping Units | 40 | 32 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| Fab Process | 55 nm | 28 nm |
| Transistors | 956 million | 1500 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: Bandwidth is the max amount of data (measured in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.
Radeon HD 4870 512MBAmazon.com
Check prices at:
|
Radeon HD 7750Amazon.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.
|
Comments
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