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GeForce GT 240 GDDR5 vs GeForce GT 640 DDR3
Intro
The GeForce GT 240 GDDR5 has a core clock frequency of 550 MHz and a GDDR5 memory frequency of 850 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is made up of 96 SPUs, 32 Texture Address Units, and 8 Raster Operation Units.Compare all of that to the GeForce GT 640 DDR3, which has core speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 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 |
| GeForce GT 240 GDDR5 |
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70 Watts |
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Memory Bandwidth
Performance-wise, the GeForce GT 640 DDR3 should theoretically be just a bit superior to the GeForce GT 240 GDDR5 overall. (explain)
| GeForce GT 640 DDR3 |
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57024 MB/sec |
| GeForce GT 240 GDDR5 |
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54400 MB/sec |
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Texel Rate
The GeForce GT 640 DDR3 is quite a bit (approximately 64%) better at anisotropic filtering than the GeForce GT 240 GDDR5. (explain)| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
| GeForce GT 240 GDDR5 |
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17600 Mtexels/sec |
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Pixel Rate
If using a high resolution is important to you, then the GeForce GT 640 DDR3 is the winner, by a large margin. (explain)| GeForce GT 640 DDR3 |
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14400 Mpixels/sec |
| GeForce GT 240 GDDR5 |
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4400 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 240 GDDR5Amazon.com
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GeForce GT 640 DDR3Amazon.com
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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 240 GDDR5 | GeForce GT 640 DDR3 |
|---|---|---|
| Manufacturer | nVidia | nVidia |
| Year | Novermber 2009 | June 2012 |
| Code Name | GT215 | GK107 |
| Memory | 512 MB | 2048 MB |
| Core Speed | 550 MHz | 900 MHz |
| Memory Speed | 3400 MHz | 3564 MHz |
| Power (Max TDP) | 70 watts | 65 watts |
| Bandwidth | 54400 MB/sec | 57024 MB/sec |
| Texel Rate | 17600 Mtexels/sec | 28800 Mtexels/sec |
| Pixel Rate | 4400 Mpixels/sec | 14400 Mpixels/sec |
| Unified Shaders | 96 | 384 |
| Texture Mapping Units | 32 | 32 |
| Render Output Units | 8 | 16 |
| Bus Type | GDDR5 | DDR3 |
| Bus Width | 128-bit | 128-bit |
| Fab Process | 40 nm | 28 nm |
| Transistors | 289 million | 1300 million |
| Bus | PCIe x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 10.1 | DirectX 11.0 |
| OpenGL Version | OpenGL 3.2 | OpenGL 4.2 |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 are applied per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at 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 the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.
GeForce GT 240 GDDR5Amazon.com
Check prices at:
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GeForce GT 640 DDR3Amazon.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
2 Responses to “GeForce GT 240 GDDR5 vs GeForce GT 640 DDR3”You have an error in GT640 description... 1782MHz of RAM speed is... its effective performance, not a real one. So its real memory bandwith is much lower than that of DDR5 GT240
leave it to a db fanboy to say something isn't so and offer no actual proof or numbers to back it up. must still be sore he got whupped by superman.