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Radeon HD 4890 2GB vs Radeon HD 6450 (OEM)
Intro
The Radeon HD 4890 2GB uses a 55 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM works at a speed of 975 MHz on this specific card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.Compare that to the Radeon HD 6450 (OEM), which has GPU clock speed of 625 MHz, and 512 MB of GDDR3 memory set to run at 800 MHz through a 64-bit bus. It also is made up of 160 Stream Processors, 8 TAUs, and 4 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6450 (OEM) |
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31 Watts |
| Radeon HD 4890 2GB |
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190 Watts |
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Memory Bandwidth
Theoretically speaking, the Radeon HD 4890 2GB should be 875% quicker than the Radeon HD 6450 (OEM) in general, because of its greater bandwidth. (explain)
| Radeon HD 4890 2GB |
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124800 MB/sec |
| Radeon HD 6450 (OEM) |
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12800 MB/sec |
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Texel Rate
The Radeon HD 4890 2GB will be much (approximately 700%) better at AF than the Radeon HD 6450 (OEM). (explain)| Radeon HD 4890 2GB |
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40000 Mtexels/sec |
| Radeon HD 6450 (OEM) |
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5000 Mtexels/sec |
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Pixel Rate
If using a high screen resolution is important to you, then the Radeon HD 4890 2GB is superior to the Radeon HD 6450 (OEM), by far. (explain)| Radeon HD 4890 2GB |
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16000 Mpixels/sec |
| Radeon HD 6450 (OEM) |
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2500 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 6450 (OEM)Amazon.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 6450 (OEM) |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Apr 2, 2009 | February 2011 |
| Code Name | RV790 XT | Caicos |
| Memory | 2048 MB | 512 MB |
| Core Speed | 1000 MHz | 625 MHz |
| Memory Speed | 3900 MHz | 1600 MHz |
| Power (Max TDP) | 190 watts | 31 watts |
| Bandwidth | 124800 MB/sec | 12800 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 5000 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 2500 Mpixels/sec |
| Unified Shaders | 800(160x5) | 160 |
| Texture Mapping Units | 40 | 8 |
| Render Output Units | 16 | 4 |
| Bus Type | GDDR5 | GDDR3 |
| Bus Width | 256-bit | 64-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 959 million | 370 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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 are applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.
Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially 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:
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Radeon HD 6450 (OEM)Amazon.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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