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GeForce GT 640 DDR3 vs Radeon HD 4750
Intro
The GeForce GT 640 DDR3 has a core clock speed of 900 MHz and a DDR3 memory speed of 1782 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 32 Texture Address Units, and 16 ROPs.Compare those specs to the Radeon HD 4750, which has a clock frequency of 730 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 640(128x5) SPUs, 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
The GeForce GT 640 DDR3 should theoretically perform a small bit faster than the Radeon HD 4750 in general. (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 a lot (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
If using a high screen resolution is important to you, then the GeForce GT 640 DDR3 is superior to the Radeon HD 4750, by far. (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 largest amount of data (in units of MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should 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, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum 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.