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Radeon HD 4890 1GB vs Radeon R7 250X 2GB
Intro
The Radeon HD 4890 1GB comes with a core clock frequency of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.Compare those specifications to the Radeon R7 250X 2GB, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon R7 250X 2GB |
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95 Watts |
| Radeon HD 4890 1GB |
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190 Watts |
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Memory Bandwidth
The Radeon HD 4890 1GB should in theory perform quite a bit faster than the Radeon R7 250X 2GB overall. (explain)
| Radeon HD 4890 1GB |
|
124800 MB/sec |
| Radeon R7 250X 2GB |
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72000 MB/sec |
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Texel Rate
Both cards have exactly the same texel fill rate, so in theory they should perform equally good at at AF. (explain)Pixel Rate
Both cards have exactly the same pixel fill rate, so theoretically they should perform equally good at at AA, and be able to handle the same resolutions. (explain)
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
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Radeon R7 250X 2GBAmazon.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 1GB | Radeon R7 250X 2GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Apr 2, 2009 | February 2014 |
| Code Name | RV790 XT | Cape Verde XT |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 1000 MHz | 1000 MHz |
| Memory Speed | 3900 MHz | 4500 MHz |
| Power (Max TDP) | 190 watts | 95 watts |
| Bandwidth | 124800 MB/sec | 72000 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 40000 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 16000 Mpixels/sec |
| Unified Shaders | 800(160x5) | 640 |
| Texture Mapping Units | 40 | 40 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| Fab Process | 55 nm | 28 nm |
| Transistors | 959 million | 1500 million |
| Bus | PCIe 2.0 x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 10.1 | DirectX 11.2 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.3 |
Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It's worked out 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 4 instead. The better the card's memory bandwidth, 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 can be processed per second. This figure is calculated by multiplying the total texture units of the card 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 per second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.
Radeon HD 4890 1GBAmazon.com
Check prices at:
|
Radeon R7 250X 2GBAmazon.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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