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GeForce GTX 660 Ti vs Radeon HD 4890 2GB
Intro
The GeForce GTX 660 Ti comes with a clock frequency of 915 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 192-bit memory bus, and uses a 28 nm design. It is comprised of 1344 SPUs, 112 Texture Address Units, and 24 ROPs.Compare those specifications to the Radeon HD 4890 2GB, which 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 particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| GeForce GTX 660 Ti |
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150 Watts |
| Radeon HD 4890 2GB |
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190 Watts |
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Memory Bandwidth
As far as performance goes, the GeForce GTX 660 Ti should in theory be a bit superior to the Radeon HD 4890 2GB overall. (explain)
| GeForce GTX 660 Ti |
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144000 MB/sec |
| Radeon HD 4890 2GB |
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124800 MB/sec |
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Texel Rate
The GeForce GTX 660 Ti should be much (more or less 156%) faster with regards to texture filtering than the Radeon HD 4890 2GB. (explain)| GeForce GTX 660 Ti |
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102480 Mtexels/sec |
| Radeon HD 4890 2GB |
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40000 Mtexels/sec |
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Pixel Rate
The GeForce GTX 660 Ti should be much (about 37%) better at full screen anti-aliasing than the Radeon HD 4890 2GB, and also able to handle higher resolutions without losing too much performance. (explain)| GeForce GTX 660 Ti |
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21960 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
GeForce GTX 660 TiAmazon.com
Check prices at:
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Radeon HD 4890 2GBAmazon.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 | GeForce GTX 660 Ti | Radeon HD 4890 2GB |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | August 2012 | Apr 2, 2009 |
| Code Name | GK104 | RV790 XT |
| Memory | 2048 MB | 2048 MB |
| Core Speed | 915 MHz | 1000 MHz |
| Memory Speed | 6000 MHz | 3900 MHz |
| Power (Max TDP) | 150 watts | 190 watts |
| Bandwidth | 144000 MB/sec | 124800 MB/sec |
| Texel Rate | 102480 Mtexels/sec | 40000 Mtexels/sec |
| Pixel Rate | 21960 Mpixels/sec | 16000 Mpixels/sec |
| Unified Shaders | 1344 | 800(160x5) |
| Texture Mapping Units | 112 | 40 |
| Render Output Units | 24 | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 192-bit | 256-bit |
| Fab Process | 28 nm | 55 nm |
| Transistors | 3540 million | 959 million |
| Bus | PCIe 3.0 x16 | PCIe 2.0 x16 |
| DirectX Version | DirectX 11.0 | DirectX 10.1 |
| OpenGL Version | OpenGL 4.3 | OpenGL 3.0 |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once 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 AA, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.
GeForce GTX 660 TiAmazon.com
Check prices at:
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Radeon HD 4890 2GBAmazon.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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