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GeForce GTX 295 vs Radeon HD 4890 2GB
Intro
The GeForce GTX 295 features clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 memory. It features 240 SPUs along with 80 TAUs and 28 ROPs.Compare those specs to the Radeon HD 4890 2GB, which uses a 55 nm design. ATi has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 975 MHz on this card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4890 2GB |
|
190 Watts |
| GeForce GTX 295 |
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289 Watts |
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Memory Bandwidth
Theoretically speaking, the GeForce GTX 295 will be 79% faster than the Radeon HD 4890 2GB overall, because of its greater data rate. (explain)
| GeForce GTX 295 |
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223776 MB/sec |
| Radeon HD 4890 2GB |
|
124800 MB/sec |
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Texel Rate
The GeForce GTX 295 is much (about 130%) better at AF than the Radeon HD 4890 2GB. (explain)| GeForce GTX 295 |
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92160 Mtexels/sec |
| Radeon HD 4890 2GB |
|
40000 Mtexels/sec |
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Pixel Rate
The GeForce GTX 295 should be quite a bit (about 102%) better at full screen anti-aliasing than the Radeon HD 4890 2GB, and able to handle higher screen resolutions without losing too much performance. (explain)| GeForce GTX 295 |
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32256 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.
One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.
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 295Amazon.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
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Specifications
| Model | GeForce GTX 295 | Radeon HD 4890 2GB |
|---|---|---|
| Manufacturer | nVidia | ATi |
| Year | January 8, 2009 | Apr 2, 2009 |
| Code Name | G200b | RV790 XT |
| Fab Process | 55 nm | 55 nm |
| Bus | PCIe x16 2.0 | PCIe 2.0 x16 |
| Memory | 896 MB (x2) | 2048 MB |
| Core Speed | 576 MHz (x2) | 1000 MHz |
| Shader Speed | 1242 MHz (x2) | (N/A) MHz |
| Memory Speed | 999 MHz (x2) | 975 MHz |
| Unified Shaders | 240 (x2) | 800(160x5) |
| Texture Mapping Units | 80 (x2) | 40 |
| Render Output Units | 28 (x2) | 16 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 448-bit (x2) | 256-bit |
| DirectX Version | DirectX 10 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.1 | OpenGL 3.0 |
| Power (Max TDP) | 289 watts | 190 watts |
| Shader Model | 4.0 | 4.1 |
| Bandwidth | 223776 MB/sec | 124800 MB/sec |
| Texel Rate | 92160 Mtexels/sec | 40000 Mtexels/sec |
| Pixel Rate | 32256 Mpixels/sec | 16000 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.
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