 |
 |
|
|
|
Geforce GTX 680 vs Radeon HD 4850 1GB
Intro
The Geforce GTX 680 makes use of a 28 nm design. nVidia has set the core frequency at 1006 MHz. The GDDR5 RAM works at a frequency of 1502 MHz on this specific model. It features 1536 SPUs as well as 128 Texture Address Units and 32 ROPs.Compare those specifications to the Radeon HD 4850 1GB, which uses a 55 nm design. ATi has clocked the core frequency at 625 MHz. The GDDR4 memory is set to run at a speed of 993 MHz on this particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4850 1GB |
|
110 Watts |
| Geforce GTX 680 |
|
195 Watts |
|
|
Memory Bandwidth
Theoretically, the Geforce GTX 680 should perform much faster than the Radeon HD 4850 1GB overall. (explain)
| Geforce GTX 680 |
|
192256 MB/sec |
| Radeon HD 4850 1GB |
|
63552 MB/sec |
|
|
Texel Rate
The Geforce GTX 680 should be quite a bit (more or less 415%) more effective at AF than the Radeon HD 4850 1GB. (explain)| Geforce GTX 680 |
|
128768 Mtexels/sec |
| Radeon HD 4850 1GB |
|
25000 Mtexels/sec |
|
|
Pixel Rate
The Geforce GTX 680 should be quite a bit (approximately 222%) better at anti-aliasing than the Radeon HD 4850 1GB, and also will be capable of handling higher resolutions without slowing down too much. (explain)| Geforce GTX 680 |
|
32192 Mpixels/sec |
| Radeon HD 4850 1GB |
|
10000 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
Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.
Geforce GTX 680Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Radeon HD 4850 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Specifications
| Model | Geforce GTX 680 | Radeon HD 4850 1GB |
|---|---|---|
| Manufacturer | nVidia | ATi |
| Year | March 2012 | Jun 25, 2008 |
| Code Name | GK104 | RV770 PRO |
| Fab Process | 28 nm | 55 nm |
| Bus | PCIe 3.0 x16 | PCIe 2.0 x16 |
| Memory | 2048 MB | 1024 MB |
| Core Speed | 1006 MHz | 625 MHz |
| Shader Speed | 1006 MHz | (N/A) MHz |
| Memory Speed | 1502 MHz (6008 MHz effective) | 993 MHz (1986 MHz effective) |
| Unified Shaders | 1536 | 800(160x5) |
| Texture Mapping Units | 128 | 40 |
| Render Output Units | 32 | 16 |
| Bus Type | GDDR5 | GDDR4 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 11.1 | DirectX 10.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 3.0 |
| Power (Max TDP) | 195 watts | 110 watts |
| Shader Model | 5.0 | 4.1 |
| Bandwidth | 192256 MB/sec | 63552 MB/sec |
| Texel Rate | 128768 Mtexels/sec | 25000 Mtexels/sec |
| Pixel Rate | 32192 Mpixels/sec | 10000 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR memory, 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 anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at 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 its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.
Comments
Be the first to leave a comment!