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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 RAM is set to run at a speed of 1782 MHz on this particular card. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.Compare all of that to the Radeon HD 4750, which features core clock speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator 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 in theory perform a little 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 is a lot (more or less 23%) better at texture 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 should be a lot (approximately 23%) faster with regards to full screen anti-aliasing than the Radeon HD 4750, and also should be able to handle higher resolutions better. (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 megabytes per second) that can be transported over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 can be applied in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. 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 lots of other factors, especially the memory bandwidth - 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.