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Radeon HD 4890 2GB vs Radeon HD 6670 (OEM) 1GB
Intro
The Radeon HD 4890 2GB makes use of a 55 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 975 MHz on this specific card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.Compare those specifications to the Radeon HD 6670 (OEM) 1GB, which has GPU core speed of 800 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also features 480 Stream Processors, 24 TAUs, and 8 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6670 (OEM) 1GB |
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63 Watts |
| Radeon HD 4890 2GB |
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190 Watts |
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Memory Bandwidth
The Radeon HD 4890 2GB should in theory be much faster than the Radeon HD 6670 (OEM) 1GB overall. (explain)
| Radeon HD 4890 2GB |
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124800 MB/sec |
| Radeon HD 6670 (OEM) 1GB |
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64000 MB/sec |
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Texel Rate
The Radeon HD 4890 2GB should be a lot (about 108%) more effective at AF than the Radeon HD 6670 (OEM) 1GB. (explain)| Radeon HD 4890 2GB |
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40000 Mtexels/sec |
| Radeon HD 6670 (OEM) 1GB |
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19200 Mtexels/sec |
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Pixel Rate
If running with a high screen resolution is important to you, then the Radeon HD 4890 2GB is the winner, and very much so. (explain)| Radeon HD 4890 2GB |
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16000 Mpixels/sec |
| Radeon HD 6670 (OEM) 1GB |
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6400 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 6670 (OEM) 1GBAmazon.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 HD 6670 (OEM) 1GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Apr 2, 2009 | February 2011 |
| Code Name | RV790 XT | Turks |
| Memory | 2048 MB | 1024 MB |
| Core Speed | 1000 MHz | 800 MHz |
| Memory Speed | 3900 MHz | 4000 MHz |
| Power (Max TDP) | 190 watts | 63 watts |
| Bandwidth | 124800 MB/sec | 64000 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 19200 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 6400 Mpixels/sec |
| Unified Shaders | 800(160x5) | 480 |
| Texture Mapping Units | 40 | 24 |
| Render Output Units | 16 | 8 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 959 million | 715 million |
| Bus | PCIe 2.0 x16 | PCIe 2.1 x16 |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core 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 a second.
Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.
Radeon HD 4890 2GBAmazon.com
Check prices at:
|
Radeon HD 6670 (OEM) 1GBAmazon.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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