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Radeon HD 4890 1GB vs Radeon HD 6870
Intro
The Radeon HD 4890 1GB features a clock frequency of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.Compare all of that to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory is set to run at a speed of 1050 MHz on this card. It features 1120 SPUs as well as 56 TAUs and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6870 |
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151 Watts |
| Radeon HD 4890 1GB |
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190 Watts |
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Memory Bandwidth
Performance-wise, the Radeon HD 6870 should in theory be a little bit superior to the Radeon HD 4890 1GB overall. (explain)
| Radeon HD 6870 |
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134400 MB/sec |
| Radeon HD 4890 1GB |
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124800 MB/sec |
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Texel Rate
The Radeon HD 6870 will be a lot (approximately 26%) better at AF than the Radeon HD 4890 1GB. (explain)| Radeon HD 6870 |
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50400 Mtexels/sec |
| Radeon HD 4890 1GB |
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40000 Mtexels/sec |
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Pixel Rate
The Radeon HD 6870 will be a lot (more or less 80%) better at FSAA than the Radeon HD 4890 1GB, and should be capable of handling higher screen resolutions more effectively. (explain)| Radeon HD 6870 |
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28800 Mpixels/sec |
| Radeon HD 4890 1GB |
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16000 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 4890 1GBAmazon.com
Check prices at:
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Radeon HD 6870Amazon.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 4890 1GB | Radeon HD 6870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Apr 2, 2009 | October 2010 |
| Code Name | RV790 XT | Barts XT |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 1000 MHz | 900 MHz |
| Memory Speed | 3900 MHz | 4200 MHz |
| Power (Max TDP) | 190 watts | 151 watts |
| Bandwidth | 124800 MB/sec | 134400 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 28800 Mpixels/sec |
| Unified Shaders | 800(160x5) | 1120 |
| Texture Mapping Units | 40 | 56 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 959 million | 1700 million |
| Bus | PCIe 2.0 x16 | PCIe x16 |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, 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 most pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.
Radeon HD 4890 1GBAmazon.com
Check prices at:
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Radeon HD 6870Amazon.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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