 |
 |
GeForce GT 240 GDDR5 vs GeForce GT 640 DDR3
Intro
The GeForce GT 240 GDDR5 uses a 40 nm design. nVidia has clocked the core speed at 550 MHz. The GDDR5 RAM runs at a frequency of 850 MHz on this particular model. It features 96 SPUs as well as 32 Texture Address Units and 8 ROPs.Compare all that to the GeForce GT 640 DDR3, which comes with GPU core speed of 900 MHz, and 2048 MB of DDR3 memory set to run at 1782 MHz through a 128-bit bus. It also is comprised of 384 SPUs, 32 Texture Address Units, 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 in theory be a bit faster than the GeForce GT 240 GDDR5 overall. (explain)
| GeForce GT 640 DDR3 |
|
57024 MB/sec |
| GeForce GT 240 GDDR5 |
|
54400 MB/sec |
|
|
Texel Rate
The GeForce GT 640 DDR3 is a lot (approximately 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 is a lot (about 227%) faster with regards to AA than the GeForce GT 240 GDDR5, and able to handle higher screen resolutions without slowing down too much. (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 max amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video 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 most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max 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.