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Radeon HD 4890 2GB vs Radeon HD 7870
Intro
The Radeon HD 4890 2GB features core clock speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.Compare those specifications to the Radeon HD 7870, which has clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7870 |
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175 Watts |
| Radeon HD 4890 2GB |
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190 Watts |
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Memory Bandwidth
The Radeon HD 7870, in theory, should be much faster than the Radeon HD 4890 2GB in general. (explain)
| Radeon HD 7870 |
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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 7870 will be a lot (about 100%) better at anisotropic filtering than the Radeon HD 4890 2GB. (explain)| Radeon HD 7870 |
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80000 Mtexels/sec |
| Radeon HD 4890 2GB |
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40000 Mtexels/sec |
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Pixel Rate
The Radeon HD 7870 will be quite a bit (more or less 100%) faster with regards to FSAA than the Radeon HD 4890 2GB, and also capable of handling higher resolutions while still performing well. (explain)| Radeon HD 7870 |
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32000 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
Radeon HD 4890 2GBAmazon.com
Check prices at:
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Radeon HD 7870Amazon.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 2GB | Radeon HD 7870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Apr 2, 2009 | March 2012 |
| Code Name | RV790 XT | Pitcairn XT |
| Memory | 2048 MB | 2048 MB |
| Core Speed | 1000 MHz | 1000 MHz |
| Memory Speed | 3900 MHz | 4800 MHz |
| Power (Max TDP) | 190 watts | 175 watts |
| Bandwidth | 124800 MB/sec | 153600 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 80000 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 32000 Mpixels/sec |
| Unified Shaders | 800(160x5) | 1280 |
| Texture Mapping Units | 40 | 80 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 55 nm | 28 nm |
| Transistors | 959 million | 2800 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 maximum amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core 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 processed in a second.
Pixel Rate: Pixel rate is the most pixels the video 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 number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.
Radeon HD 4890 2GBAmazon.com
Check prices at:
|
Radeon HD 7870Amazon.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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