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GeForce GT 640 DDR3 vs Radeon HD 4750
Intro
The GeForce GT 640 DDR3 features a GPU core speed of 900 MHz, and the 2048 MB of DDR3 RAM runs at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 ROPs.Compare all that to the Radeon HD 4750, which has GPU core speed of 730 MHz, and 512 MB of GDDR5 RAM running at 800 MHz through a 128-bit bus. It also features 640(128x5) Stream Processors, 32 TAUs, and 16 Raster Operation Units.
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 should be 11% quicker than the Radeon HD 4750 overall, because of its greater bandwidth. (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 will be much (about 23%) better at AF 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 will be quite a bit (more or less 23%) faster with regards to anti-aliasing than the Radeon HD 4750, and also able to handle higher resolutions while still performing well. (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
Check prices at:
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Radeon HD 4750Amazon.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 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 information (measured in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.
Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends 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.
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.