 |
 |
GeForce GT 240 GDDR5 vs GeForce GT 640 DDR3
Intro
The GeForce GT 240 GDDR5 comes with core clock speeds of 550 MHz on the GPU, and 850 MHz on the 512 MB of GDDR5 memory. It features 96 SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.Compare those specifications to the GeForce GT 640 DDR3, which has a clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 384 SPUs, 32 TAUs, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| GeForce GT 640 DDR3 |
|
65 Watts |
| GeForce GT 240 GDDR5 |
|
70 Watts |
|
|
Memory Bandwidth
The GeForce GT 640 DDR3 should theoretically be a little bit faster than the GeForce GT 240 GDDR5 in general. (explain)
| GeForce GT 640 DDR3 |
|
57024 MB/sec |
| GeForce GT 240 GDDR5 |
|
54400 MB/sec |
|
|
Texel Rate
The GeForce GT 640 DDR3 is much (about 64%) better at AF than the GeForce GT 240 GDDR5. (explain)| GeForce GT 640 DDR3 |
|
28800 Mtexels/sec |
| GeForce GT 240 GDDR5 |
|
17600 Mtexels/sec |
|
|
Pixel Rate
The GeForce GT 640 DDR3 will be much (more or less 227%) more effective at FSAA than the GeForce GT 240 GDDR5, and also will be able to handle higher resolutions better. (explain)| GeForce GT 640 DDR3 |
|
14400 Mpixels/sec |
| GeForce GT 240 GDDR5 |
|
4400 Mpixels/sec |
|
|
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
Check prices at:
|
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.
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 largest amount of information (measured in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.
GeForce GT 240 GDDR5Amazon.com
Check prices at:
|
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.