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GeForce GT 640 DDR3 vs Radeon HD 4750
Intro
The GeForce GT 640 DDR3 uses a 28 nm design. nVidia has set the core speed at 900 MHz. The DDR3 memory is set to run at a speed of 1782 MHz on this card. It features 384 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.Compare all of that to the Radeon HD 4750, which makes use of a 40 nm design. AMD has clocked the core speed at 730 MHz. The GDDR5 RAM runs at a frequency of 800 MHz on this model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| GeForce GT 640 DDR3 |
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65 Watts |
| Radeon HD 4750 |
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75 Watts |
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Memory Bandwidth
Theoretically speaking, the GeForce GT 640 DDR3 will be 11% faster than the Radeon HD 4750 in general, due to its greater data rate. (explain)
| GeForce GT 640 DDR3 |
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57024 MB/sec |
| Radeon HD 4750 |
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51200 MB/sec |
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Texel Rate
The GeForce GT 640 DDR3 is quite a bit (about 23%) faster with regards to anisotropic filtering than the Radeon HD 4750. (explain)| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
| Radeon HD 4750 |
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23360 Mtexels/sec |
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Pixel Rate
The GeForce GT 640 DDR3 is quite a bit (approximately 23%) better at AA than the Radeon HD 4750, and also able to handle higher screen resolutions more effectively. (explain)| GeForce GT 640 DDR3 |
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14400 Mpixels/sec |
| Radeon HD 4750 |
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11680 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
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Radeon HD 4750Amazon.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 | GeForce GT 640 DDR3 | Radeon HD 4750 |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | June 2012 | |
| Code Name | GK107 | RV740 |
| Memory | 2048 MB | 512 MB |
| Core Speed | 900 MHz | 730 MHz |
| Memory Speed | 3564 MHz | 3200 MHz |
| Power (Max TDP) | 65 watts | 75 watts |
| Bandwidth | 57024 MB/sec | 51200 MB/sec |
| Texel Rate | 28800 Mtexels/sec | 23360 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 11680 Mpixels/sec |
| Unified Shaders | 384 | 640(128x5) |
| Texture Mapping Units | 32 | 32 |
| Render Output Units | 16 | 16 |
| Bus Type | DDR3 | GDDR5 |
| Bus Width | 128-bit | 128-bit |
| Fab Process | 28 nm | 40 nm |
| Transistors | 1300 million | 826 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 maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.
GeForce GT 640 DDR3Amazon.com
Check prices at:
|
Radeon HD 4750Amazon.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.
|
Comments
One Response to “GeForce GT 640 DDR3 vs Radeon HD 4750”This is wrong information about asus gt 640 ddr3,bandwidth is not 57024 MB/sec,it is half that because you were multiplying efective clock 1782 MHz.Real clock is 891Mhz so banwidth is 28518 Mb/s.