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Radeon HD 4890 2GB vs Radeon HD 7870 XT
Intro
The Radeon HD 4890 2GB features a core clock frequency of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.Compare those specs to the Radeon HD 7870 XT, which features core clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7870 XT |
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185 Watts |
| Radeon HD 4890 2GB |
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190 Watts |
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Memory Bandwidth
As far as performance goes, the Radeon HD 7870 XT should in theory be a lot superior to the Radeon HD 4890 2GB overall. (explain)
| Radeon HD 7870 XT |
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192000 MB/sec |
| Radeon HD 4890 2GB |
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124800 MB/sec |
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Texel Rate
The Radeon HD 7870 XT is much (approximately 122%) faster with regards to AF than the Radeon HD 4890 2GB. (explain)| Radeon HD 7870 XT |
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88800 Mtexels/sec |
| Radeon HD 4890 2GB |
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40000 Mtexels/sec |
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Pixel Rate
If running with high levels of AA is important to you, then the Radeon HD 7870 XT is superior to the Radeon HD 4890 2GB, by far. (explain)| Radeon HD 7870 XT |
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29600 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
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Radeon HD 7870 XTAmazon.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 XT |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Apr 2, 2009 | November 2012 |
| Code Name | RV790 XT | Tahiti LE |
| Memory | 2048 MB | 2048 MB |
| Core Speed | 1000 MHz | 925 MHz |
| Memory Speed | 3900 MHz | 6000 MHz |
| Power (Max TDP) | 190 watts | 185 watts |
| Bandwidth | 124800 MB/sec | 192000 MB/sec |
| Texel Rate | 40000 Mtexels/sec | 88800 Mtexels/sec |
| Pixel Rate | 16000 Mpixels/sec | 29600 Mpixels/sec |
| Unified Shaders | 800(160x5) | 1536 |
| Texture Mapping Units | 40 | 96 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 55 nm | 28 nm |
| Transistors | 959 million | 4313 million |
| Bus | PCIe 2.0 x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 10.1 | DirectX 11.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.3 |
Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the 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 maximum amount of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the 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 7870 XTAmazon.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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