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GeForce GT 640 DDR3 vs GeForce GTX 260 216SP 55 nm
Intro
The GeForce GT 640 DDR3 makes use of a 28 nm design. nVidia has clocked the core frequency at 900 MHz. The DDR3 memory runs at a speed of 1782 MHz on this card. It features 384 SPUs along with 32 Texture Address Units and 16 ROPs.Compare that to the GeForce GTX 260 216SP 55 nm, which has clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 memory. It features 216 SPUs along with 72 Texture Address Units and 28 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| GeForce GT 640 DDR3 |
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65 Watts |
| GeForce GTX 260 216SP 55 nm |
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171 Watts |
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Memory Bandwidth
Theoretically speaking, the GeForce GTX 260 216SP 55 nm should be a lot faster than the GeForce GT 640 DDR3 overall. (explain)
| GeForce GTX 260 216SP 55 nm |
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111888 MB/sec |
| GeForce GT 640 DDR3 |
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57024 MB/sec |
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Texel Rate
The GeForce GTX 260 216SP 55 nm should be a lot (approximately 44%) more effective at AF than the GeForce GT 640 DDR3. (explain)| GeForce GTX 260 216SP 55 nm |
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41472 Mtexels/sec |
| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
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Pixel Rate
If using a high resolution is important to you, then the GeForce GTX 260 216SP 55 nm is superior to the GeForce GT 640 DDR3, though only just barely. (explain)| GeForce GTX 260 216SP 55 nm |
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16128 Mpixels/sec |
| GeForce GT 640 DDR3 |
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14400 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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GeForce GTX 260 216SP 55 nmAmazon.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 | GeForce GTX 260 216SP 55 nm |
|---|---|---|
| Manufacturer | nVidia | nVidia |
| Year | June 2012 | December 22, 2008 |
| Code Name | GK107 | G200b |
| Memory | 2048 MB | 896 MB |
| Core Speed | 900 MHz | 576 MHz |
| Memory Speed | 3564 MHz | 1998 MHz |
| Power (Max TDP) | 65 watts | 171 watts |
| Bandwidth | 57024 MB/sec | 111888 MB/sec |
| Texel Rate | 28800 Mtexels/sec | 41472 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 16128 Mpixels/sec |
| Unified Shaders | 384 | 216 |
| Texture Mapping Units | 32 | 72 |
| Render Output Units | 16 | 28 |
| Bus Type | DDR3 | GDDR3 |
| Bus Width | 128-bit | 448-bit |
| Fab Process | 28 nm | 55 nm |
| Transistors | 1300 million | 1400 million |
| Bus | PCIe 3.0 x16 | PCIe x16 2.0 |
| DirectX Version | DirectX 11.0 | DirectX 10 |
| OpenGL Version | OpenGL 4.2 | OpenGL 3.1 |
Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units of the card 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 in a second.
Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.
GeForce GT 640 DDR3Amazon.com
Check prices at:
|
GeForce GTX 260 216SP 55 nmAmazon.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 GeForce GTX 260 216SP 55 nm”Thank you so much for this comparison. I own the 260 & wondered if a new, budget card was worth it. Answer: nope!