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GeForce 8800 GTS (G80) 640MB vs Radeon HD 4850 2GB
Intro
The GeForce 8800 GTS (G80) 640MB has a core clock frequency of 513 MHz and a GDDR3 memory speed of 792 MHz. It also makes use of a 320-bit bus, and makes use of a 90 nm design. It is made up of 96 SPUs, 48 Texture Address Units, and 20 Raster Operation Units.Compare all that to the Radeon HD 4850 2GB, which has a core clock frequency of 625 MHz and a GDDR4 memory speed of 993 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4850 2GB |
|
110 Watts |
| GeForce 8800 GTS (G80) 640MB |
|
143 Watts |
|
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Memory Bandwidth
The Radeon HD 4850 2GB should in theory be a little bit faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)
| Radeon HD 4850 2GB |
|
63552 MB/sec |
| GeForce 8800 GTS (G80) 640MB |
|
63360 MB/sec |
|
|
Texel Rate
The Radeon HD 4850 2GB should be a little bit (approximately 2%) better at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)| Radeon HD 4850 2GB |
|
25000 Mtexels/sec |
| GeForce 8800 GTS (G80) 640MB |
|
24624 Mtexels/sec |
|
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Pixel Rate
If running with a high screen resolution is important to you, then the GeForce 8800 GTS (G80) 640MB is superior to the Radeon HD 4850 2GB, not by a very large margin though. (explain)| GeForce 8800 GTS (G80) 640MB |
|
10260 Mpixels/sec |
| Radeon HD 4850 2GB |
|
10000 Mpixels/sec |
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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 8800 GTS (G80) 640MBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 4850 2GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
|
Specifications
| Model | GeForce 8800 GTS (G80) 640MB | Radeon HD 4850 2GB |
|---|---|---|
| Manufacturer | nVidia | ATi |
| Year | Nov 2006 (640) | Jun 25, 2008 |
| Code Name | G80 | RV770 PRO |
| Fab Process | 90 nm | 55 nm |
| Bus | PCIe x16 | PCIe 2.0 x16 |
| Memory | 640 MB | 2048 MB |
| Core Speed | 513 MHz | 625 MHz |
| Shader Speed | 1188 MHz | (N/A) MHz |
| Memory Speed | 792 MHz | 993 MHz |
| Unified Shaders | 96 | 800(160x5) |
| Texture Mapping Units | 48 | 40 |
| Render Output Units | 20 | 16 |
| Bus Type | GDDR3 | GDDR4 |
| Bus Width | 320-bit | 256-bit |
| DirectX Version | DirectX 10 | DirectX 10.1 |
| OpenGL Version | OpenGL 3.0 | OpenGL 3.0 |
| Power (Max TDP) | 143 watts | 110 watts |
| Shader Model | 4.0 | 4.1 |
| Bandwidth | 63360 MB/sec | 63552 MB/sec |
| Texel Rate | 24624 Mtexels/sec | 25000 Mtexels/sec |
| Pixel Rate | 10260 Mpixels/sec | 10000 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range 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 clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.
Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.
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