 |
 |
|
|
|
GeForce 9800 GTX+ vs Radeon HD 4850 2GB
Intro
The GeForce 9800 GTX+ uses a 55 nm design. nVidia has clocked the core speed at 738 MHz. The GDDR3 RAM runs at a frequency of 1100 MHz on this card. It features 128 SPUs along with 64 TAUs and 16 Rasterization Operator Units.Compare all that to the Radeon HD 4850 2GB, which comes with a clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4850 2GB |
|
110 Watts |
| GeForce 9800 GTX+ |
|
145 Watts |
|
|
Memory Bandwidth
The GeForce 9800 GTX+ should in theory be a small bit faster than the Radeon HD 4850 2GB overall. (explain)
| GeForce 9800 GTX+ |
|
70400 MB/sec |
| Radeon HD 4850 2GB |
|
63552 MB/sec |
|
|
Texel Rate
The GeForce 9800 GTX+ will be quite a bit (about 89%) more effective at AF than the Radeon HD 4850 2GB. (explain)| GeForce 9800 GTX+ |
|
47232 Mtexels/sec |
| Radeon HD 4850 2GB |
|
25000 Mtexels/sec |
|
|
Pixel Rate
The GeForce 9800 GTX+ will be a small bit (more or less 18%) better at FSAA than the Radeon HD 4850 2GB, and also capable of handling higher screen resolutions without losing too much performance. (explain)| GeForce 9800 GTX+ |
|
11808 Mpixels/sec |
| Radeon HD 4850 2GB |
|
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 9800 GTX+Amazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Radeon HD 4850 2GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Specifications
| Model | GeForce 9800 GTX+ | Radeon HD 4850 2GB |
|---|---|---|
| Manufacturer | nVidia | ATi |
| Year | July 2008 | Jun 25, 2008 |
| Code Name | G92b | RV770 PRO |
| Fab Process | 55 nm | 55 nm |
| Bus | PCIe x16 2.0 | PCIe 2.0 x16 |
| Memory | 512 MB | 2048 MB |
| Core Speed | 738 MHz | 625 MHz |
| Shader Speed | 1836 MHz | (N/A) MHz |
| Memory Speed | 1100 MHz | 993 MHz |
| Unified Shaders | 128 | 800(160x5) |
| Texture Mapping Units | 64 | 40 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR3 | GDDR4 |
| Bus Width | 256-bit | 256-bit |
| DirectX Version | DirectX 10 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
| Power (Max TDP) | 145 watts | 110 watts |
| Shader Model | 4.0 | 4.1 |
| Bandwidth | 70400 MB/sec | 63552 MB/sec |
| Texel Rate | 47232 Mtexels/sec | 25000 Mtexels/sec |
| Pixel Rate | 11808 Mpixels/sec | 10000 Mpixels/sec |
Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 processed in one second. This number is worked out by multiplying the total amount of texture units by the core clock 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 video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.
Comments
Be the first to leave a comment!