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Radeon HD 4890 2GB vs Radeon HD 5870
Intro
The Radeon HD 4890 2GB comes with a clock speed of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also makes use of a 256-bit 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 5870, which uses a 40 nm design. ATi has set the core speed at 850 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this specific card. It features 1600(320x5) SPUs as well as 80 Texture Address Units and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 5870 |
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188 Watts |
| Radeon HD 4890 2GB |
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190 Watts |
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Memory Bandwidth
Theoretically speaking, the Radeon HD 5870 should be quite a bit faster than the Radeon HD 4890 2GB overall. (explain)
| Radeon HD 5870 |
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153600 MB/sec |
| Radeon HD 4890 2GB |
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124800 MB/sec |
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Texel Rate
The Radeon HD 5870 is a lot (approximately 70%) better at anisotropic filtering than the Radeon HD 4890 2GB. (explain)| Radeon HD 5870 |
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68000 Mtexels/sec |
| Radeon HD 4890 2GB |
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40000 Mtexels/sec |
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Pixel Rate
The Radeon HD 5870 is a lot (more or less 70%) more effective at anti-aliasing than the Radeon HD 4890 2GB, and should be capable of handling higher screen resolutions without losing too much performance. (explain)| Radeon HD 5870 |
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27200 Mpixels/sec |
| Radeon HD 4890 2GB |
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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
Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.
Radeon HD 4890 2GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 5870Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 4890 2GB | Radeon HD 5870 |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Apr 2, 2009 | September 23, 2009 |
| Code Name | RV790 XT | Cypress XT |
| Fab Process | 55 nm | 40 nm |
| Bus | PCIe 2.0 x16 | PCIe 2.1 x16 |
| Memory | 2048 MB | 1024 MB |
| Core Speed | 1000 MHz | 850 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 975 MHz | 1200 MHz |
| Unified Shaders | 800(160x5) | 1600(320x5) |
| Texture Mapping Units | 40 | 80 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.2 |
| Power (Max TDP) | 190 watts | 188 watts |
| Shader Model | 4.1 | 5.0 |
| Bandwidth | 124800 MB/sec | 153600 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 68000 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 27200 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video 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 maximum number of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.
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