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GeForce GT 640 DDR3 vs Radeon HD 3470 256MB
Intro
The GeForce GT 640 DDR3 comes with 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 is made up of 384 SPUs, 32 TAUs, and 16 ROPs.Compare all that to the Radeon HD 3470 256MB, which comes with core clock speeds of 800 MHz on the GPU, and 950 MHz on the 256 MB of DDR2 memory. It features 40(8x5) SPUs along with 4 TAUs and 4 ROPs.
Power Usage and Theoretical Benchmarks
Memory Bandwidth
Performance-wise, the GeForce GT 640 DDR3 should in theory be quite a bit superior to the Radeon HD 3470 256MB overall. (explain)
| GeForce GT 640 DDR3 |
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57024 MB/sec |
| Radeon HD 3470 256MB |
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30400 MB/sec |
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Texel Rate
The GeForce GT 640 DDR3 will be quite a bit (about 800%) more effective at anisotropic filtering than the Radeon HD 3470 256MB. (explain)| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
| Radeon HD 3470 256MB |
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3200 Mtexels/sec |
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Pixel Rate
The GeForce GT 640 DDR3 will be much (more or less 350%) better at full screen anti-aliasing than the Radeon HD 3470 256MB, and also able to handle higher screen resolutions without losing too much performance. (explain)| GeForce GT 640 DDR3 |
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14400 Mpixels/sec |
| Radeon HD 3470 256MB |
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3200 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 3470 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 3470 256MB |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | June 2012 | 2008 |
| Code Name | GK107 | RV620 PRO |
| Memory | 2048 MB | 256 MB |
| Core Speed | 900 MHz | 800 MHz |
| Memory Speed | 3564 MHz | 1900 MHz |
| Power (Max TDP) | 65 watts | (Unknown) watts |
| Bandwidth | 57024 MB/sec | 30400 MB/sec |
| Texel Rate | 28800 Mtexels/sec | 3200 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 3200 Mpixels/sec |
| Unified Shaders | 384 | 40(8x5) |
| Texture Mapping Units | 32 | 4 |
| Render Output Units | 16 | 4 |
| Bus Type | DDR3 | DDR2 |
| Bus Width | 128-bit | 128-bit |
| Fab Process | 28 nm | 55 nm |
| Transistors | 1300 million | (Unknown) 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 information (counted in megabytes per second) that can be moved across the external memory interface in one second. It's 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 it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video 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 number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.
GeForce GT 640 DDR3Amazon.com
Check prices at:
|
Radeon HD 3470 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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