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GeForce GT 640 DDR3 vs Radeon HD 4550 256MB
Intro
The GeForce GT 640 DDR3 has a core clock frequency of 900 MHz and a DDR3 memory frequency of 1782 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It features 384 SPUs, 32 Texture Address Units, and 16 ROPs.Compare those specs to the Radeon HD 4550 256MB, which comes with a GPU core clock speed of 600 MHz, and 256 MB of DDR3 RAM set to run at 800 MHz through a 64-bit bus. It also is comprised of 80(16x5) SPUs, 8 TAUs, and 4 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4550 256MB |
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25 Watts |
| GeForce GT 640 DDR3 |
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65 Watts |
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Memory Bandwidth
In theory, the GeForce GT 640 DDR3 should be 346% quicker than the Radeon HD 4550 256MB in general, due to its greater bandwidth. (explain)
| GeForce GT 640 DDR3 |
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57024 MB/sec |
| Radeon HD 4550 256MB |
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12800 MB/sec |
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Texel Rate
The GeForce GT 640 DDR3 is much (more or less 500%) better at anisotropic filtering than the Radeon HD 4550 256MB. (explain)| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
| Radeon HD 4550 256MB |
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4800 Mtexels/sec |
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Pixel Rate
The GeForce GT 640 DDR3 will be a lot (more or less 500%) better at FSAA than the Radeon HD 4550 256MB, and will be capable of handling higher resolutions without losing too much performance. (explain)| GeForce GT 640 DDR3 |
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14400 Mpixels/sec |
| Radeon HD 4550 256MB |
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2400 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 GT 640 DDR3Amazon.com
Check prices at:
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Radeon HD 4550 256MBAmazon.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 GT 640 DDR3 | Radeon HD 4550 256MB |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | June 2012 | Sep 30, 2008 |
| Code Name | GK107 | RV710 |
| Memory | 2048 MB | 256 MB |
| Core Speed | 900 MHz | 600 MHz |
| Memory Speed | 3564 MHz | 1600 MHz |
| Power (Max TDP) | 65 watts | 25 watts |
| Bandwidth | 57024 MB/sec | 12800 MB/sec |
| Texel Rate | 28800 Mtexels/sec | 4800 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 2400 Mpixels/sec |
| Unified Shaders | 384 | 80(16x5) |
| Texture Mapping Units | 32 | 8 |
| Render Output Units | 16 | 4 |
| Bus Type | DDR3 | DDR3 |
| Bus Width | 128-bit | 64-bit |
| Fab Process | 28 nm | 55 nm |
| Transistors | 1300 million | 242 million |
| Bus | PCIe 3.0 x16 | PCIe 2.0 x16 |
| DirectX Version | DirectX 11.0 | DirectX 10.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 3.0 |
Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the 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 - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.
GeForce GT 640 DDR3Amazon.com
Check prices at:
|
Radeon HD 4550 256MBAmazon.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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