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GeForce GTX 280 vs Radeon HD 4890 2GB
Intro
The GeForce GTX 280 comes with a clock frequency of 602 MHz and a GDDR3 memory frequency of 1107 MHz. It also uses a 512-bit memory bus, and makes use of a 65 nm design. It is comprised of 240 SPUs, 80 TAUs, and 32 Raster Operation Units.Compare that to the Radeon HD 4890 2GB, which has a core clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4890 2GB |
|
190 Watts |
| GeForce GTX 280 |
|
236 Watts |
|
|
Memory Bandwidth
In theory, the GeForce GTX 280 should perform a small bit faster than the Radeon HD 4890 2GB in general. (explain)
| GeForce GTX 280 |
|
141696 MB/sec |
| Radeon HD 4890 2GB |
|
124800 MB/sec |
|
|
Texel Rate
The GeForce GTX 280 is a small bit (more or less 20%) better at texture filtering than the Radeon HD 4890 2GB. (explain)| GeForce GTX 280 |
|
48160 Mtexels/sec |
| Radeon HD 4890 2GB |
|
40000 Mtexels/sec |
|
|
Pixel Rate
The GeForce GTX 280 is just a bit (about 20%) better at FSAA than the Radeon HD 4890 2GB, and also should be able to handle higher screen resolutions more effectively. (explain)| GeForce GTX 280 |
|
19264 Mpixels/sec |
| Radeon HD 4890 2GB |
|
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
Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.
GeForce GTX 280Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 4890 2GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Specifications
| Model | GeForce GTX 280 | Radeon HD 4890 2GB |
|---|---|---|
| Manufacturer | nVidia | ATi |
| Year | June 17, 2008 | Apr 2, 2009 |
| Code Name | G200 | RV790 XT |
| Fab Process | 65 nm | 55 nm |
| Bus | PCIe x16 2.0 | PCIe 2.0 x16 |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 602 MHz | 1000 MHz |
| Shader Speed | 1296 MHz | (N/A) MHz |
| Memory Speed | 1107 MHz | 975 MHz |
| Unified Shaders | 240 | 800(160x5) |
| Texture Mapping Units | 80 | 40 |
| Render Output Units | 32 | 16 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 512-bit | 256-bit |
| DirectX Version | DirectX 10 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.1 | OpenGL 3.0 |
| Power (Max TDP) | 236 watts | 190 watts |
| Shader Model | 4.0 | 4.1 |
| Bandwidth | 141696 MB/sec | 124800 MB/sec |
| Texel Rate | 48160 Mtexels/sec | 40000 Mtexels/sec |
| Pixel Rate | 19264 Mpixels/sec | 16000 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core clock 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 most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.
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