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GeForce GT 640 DDR3 vs Radeon HD 3850 1GB
Intro
The GeForce GT 640 DDR3 comes with 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 TAUs and 16 ROPs.Compare those specifications to the Radeon HD 3850 1GB, which features core speeds of 668 MHz on the GPU, and 828 MHz on the 1024 MB of GDDR3 memory. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| GeForce GT 640 DDR3 |
|
65 Watts |
| Radeon HD 3850 1GB |
|
75 Watts |
|
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Memory Bandwidth
Theoretically speaking, the GeForce GT 640 DDR3 should be a little bit faster than the Radeon HD 3850 1GB overall. (explain)
| GeForce GT 640 DDR3 |
|
57024 MB/sec |
| Radeon HD 3850 1GB |
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52992 MB/sec |
|
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Texel Rate
The GeForce GT 640 DDR3 should be much (about 169%) better at anisotropic filtering than the Radeon HD 3850 1GB. (explain)| GeForce GT 640 DDR3 |
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28800 Mtexels/sec |
| Radeon HD 3850 1GB |
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10688 Mtexels/sec |
|
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Pixel Rate
If running with lots of anti-aliasing is important to you, then the GeForce GT 640 DDR3 is the winner, by a large margin. (explain)| GeForce GT 640 DDR3 |
|
14400 Mpixels/sec |
| Radeon HD 3850 1GB |
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10688 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:
|
Radeon HD 3850 1GBAmazon.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.
Specifications
| Model | GeForce GT 640 DDR3 | Radeon HD 3850 1GB |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | June 2012 | Nov 19, 2007 |
| Code Name | GK107 | RV670 PRO |
| Memory | 2048 MB | 1024 MB |
| Core Speed | 900 MHz | 668 MHz |
| Memory Speed | 3564 MHz | 1656 MHz |
| Power (Max TDP) | 65 watts | 75 watts |
| Bandwidth | 57024 MB/sec | 52992 MB/sec |
| Texel Rate | 28800 Mtexels/sec | 10688 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 10688 Mpixels/sec |
| Unified Shaders | 384 | 320(64x5) |
| Texture Mapping Units | 32 | 16 |
| Render Output Units | 16 | 16 |
| Bus Type | DDR3 | GDDR3 |
| Bus Width | 128-bit | 256-bit |
| Fab Process | 28 nm | 55 nm |
| Transistors | 1300 million | (Unknown) million |
| Bus | PCIe 3.0 x16 | PCIe 2.0 x16/AGP 8x |
| DirectX Version | DirectX 11.0 | DirectX 10.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 3.0 |
Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once 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 applied per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, 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 amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.
GeForce GT 640 DDR3Amazon.com
Check prices at:
|
Radeon HD 3850 1GBAmazon.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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