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GeForce GT 640 DDR3 vs GeForce GTS 450
Intro
The GeForce GT 640 DDR3 features clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.Compare those specs to the GeForce GTS 450, which uses a 40 nm design. nVidia has clocked the core speed at 783 MHz. The GDDR5 memory runs at a speed of 902 MHz on this particular model. It features 192 SPUs along with 32 Texture Address Units and 16 ROPs.
Benchmarks
These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.
3DMark Fire Strike Graphics Score
| GeForce GT 640 DDR3 |
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1560 points |
| GeForce GTS 450 |
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1453 points |
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Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| GeForce GT 640 DDR3 |
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65 Watts |
| GeForce GTS 450 |
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106 Watts |
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Memory Bandwidth
In theory, the GeForce GTS 450 will be 1% quicker than the GeForce GT 640 DDR3 overall, due to its greater bandwidth. (explain)
| GeForce GTS 450 |
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57728 MB/sec |
| GeForce GT 640 DDR3 |
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57024 MB/sec |
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Texel Rate
The GeForce GT 640 DDR3 will be just a bit (more or less 15%) better at AF than the GeForce GTS 450. (explain)| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
| GeForce GTS 450 |
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25056 Mtexels/sec |
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Pixel Rate
The GeForce GT 640 DDR3 is a bit (approximately 15%) faster with regards to FSAA than the GeForce GTS 450, and also should be able to handle higher resolutions without slowing down too much. (explain)| GeForce GT 640 DDR3 |
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14400 Mpixels/sec |
| GeForce GTS 450 |
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12528 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
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GeForce GTS 450Amazon.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 640 DDR3 | GeForce GTS 450 |
|---|---|---|
| Manufacturer | nVidia | nVidia |
| Year | June 2012 | September 2010 |
| Code Name | GK107 | GF106 |
| Memory | 2048 MB | 512 MB |
| Core Speed | 900 MHz | 783 MHz |
| Memory Speed | 3564 MHz | 3608 MHz |
| Power (Max TDP) | 65 watts | 106 watts |
| Bandwidth | 57024 MB/sec | 57728 MB/sec |
| Texel Rate | 28800 Mtexels/sec | 25056 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 12528 Mpixels/sec |
| Unified Shaders | 384 | 192 |
| 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 | 1170 million |
| Bus | PCIe 3.0 x16 | PCIe x16 |
| DirectX Version | DirectX 11.0 | DirectX 11 |
| OpenGL Version | OpenGL 4.2 | OpenGL 4.1 |
Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units of the card by the core clock 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 one second.
Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.
GeForce GT 640 DDR3Amazon.com
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GeForce GTS 450Amazon.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.
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