 |
 |
GeForce GT 640 DDR3 vs Radeon HD 4750
Intro
The GeForce GT 640 DDR3 makes use of a 28 nm design. nVidia has set the core frequency at 900 MHz. The DDR3 RAM runs at a frequency of 1782 MHz on this particular model. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.Compare those specs to the Radeon HD 4750, which uses a 40 nm design. AMD has set the core frequency at 730 MHz. The GDDR5 memory is set to run at a speed of 800 MHz on this model. It features 640(128x5) SPUs along with 32 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 4750 |
|
75 Watts |
|
|
Memory Bandwidth
As far as performance goes, the GeForce GT 640 DDR3 should theoretically be a small bit better than the Radeon HD 4750 overall. (explain)
| GeForce GT 640 DDR3 |
|
57024 MB/sec |
| Radeon HD 4750 |
|
51200 MB/sec |
|
|
Texel Rate
The GeForce GT 640 DDR3 should be quite a bit (approximately 23%) faster with regards to anisotropic filtering than the Radeon HD 4750. (explain)| GeForce GT 640 DDR3 |
|
28800 Mtexels/sec |
| Radeon HD 4750 |
|
23360 Mtexels/sec |
|
|
Pixel Rate
The GeForce GT 640 DDR3 is much (approximately 23%) better at full screen anti-aliasing than the Radeon HD 4750, and should be capable of handling higher screen resolutions while still performing well. (explain)| GeForce GT 640 DDR3 |
|
14400 Mpixels/sec |
| Radeon HD 4750 |
|
11680 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 640 DDR3Amazon.com
Check prices at:
|
Radeon HD 4750Amazon.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 4750 |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | June 2012 | |
| Code Name | GK107 | RV740 |
| Memory | 2048 MB | 512 MB |
| Core Speed | 900 MHz | 730 MHz |
| Memory Speed | 3564 MHz | 3200 MHz |
| Power (Max TDP) | 65 watts | 75 watts |
| Bandwidth | 57024 MB/sec | 51200 MB/sec |
| Texel Rate | 28800 Mtexels/sec | 23360 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 11680 Mpixels/sec |
| Unified Shaders | 384 | 640(128x5) |
| 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 | 826 million |
| Bus | PCIe 3.0 x16 | PCIe 2.0 x16 |
| DirectX Version | DirectX 11.0 | DirectX 10.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 3.0 |
Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 max fill rate.
GeForce GT 640 DDR3Amazon.com
Check prices at:
|
Radeon HD 4750Amazon.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
One Response to “GeForce GT 640 DDR3 vs Radeon HD 4750”This is wrong information about asus gt 640 ddr3,bandwidth is not 57024 MB/sec,it is half that because you were multiplying efective clock 1782 MHz.Real clock is 891Mhz so banwidth is 28518 Mb/s.