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Radeon HD 4890 2GB vs Radeon R5 M255
Intro
The Radeon HD 4890 2GB makes use of a 55 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory works at a frequency of 975 MHz on this particular card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.Compare those specs to the Radeon R5 M255, which features a GPU core clock speed of 940 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 64-bit bus. It also is made up of 320 SPUs, 20 Texture Address Units, and 8 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Memory Bandwidth
The Radeon HD 4890 2GB should theoretically perform a lot faster than the Radeon R5 M255 overall. (explain)
| Radeon HD 4890 2GB |
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124800 MB/sec |
| Radeon R5 M255 |
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16000 MB/sec |
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Texel Rate
The Radeon HD 4890 2GB will be a lot (more or less 113%) more effective at texture filtering than the Radeon R5 M255. (explain)| Radeon HD 4890 2GB |
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40000 Mtexels/sec |
| Radeon R5 M255 |
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18800 Mtexels/sec |
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Pixel Rate
If running with high levels of AA is important to you, then the Radeon HD 4890 2GB is the winner, by a large margin. (explain)| Radeon HD 4890 2GB |
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16000 Mpixels/sec |
| Radeon R5 M255 |
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7520 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 R5 M255Amazon.com
Check prices at:
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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 R5 M255 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Apr 2, 2009 | June 2014 |
| Code Name | RV790 XT | Jet Pro |
| Memory | 2048 MB | 2048 MB |
| Core Speed | 1000 MHz | 940 MHz |
| Memory Speed | 3900 MHz | 2000 MHz |
| Power (Max TDP) | 190 watts | (Unknown) watts |
| Bandwidth | 124800 MB/sec | 16000 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 18800 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 7520 Mpixels/sec |
| Unified Shaders | 800(160x5) | 320 |
| Texture Mapping Units | 40 | 20 |
| Render Output Units | 16 | 8 |
| Bus Type | GDDR5 | DDR3 |
| Bus Width | 256-bit | 64-bit |
| Fab Process | 55 nm | 28 nm |
| Transistors | 959 million | (Unknown) million |
| Bus | PCIe 2.0 x16 | PCIe 3.0 x8 |
| DirectX Version | DirectX 10.1 | DirectX 11.2 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.3 |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.
Radeon HD 4890 2GBAmazon.com
Check prices at:
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Radeon R5 M255Amazon.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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