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Radeon HD 3870 512MB vs Radeon HD 6770 1GB
Intro
The Radeon HD 3870 512MB comes with a GPU clock speed of 775 MHz, and the 512 MB of GDDR3 memory runs at 900 MHz through a 256-bit bus. It also is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.Compare all that to the Radeon HD 6770 1GB, which makes use of a 40 nm design. ATi has set the core frequency at 900 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this model. It features 800 SPUs as well as 40 TAUs and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 3870 512MB |
|
106 Watts |
| Radeon HD 6770 1GB |
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108 Watts |
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Memory Bandwidth
In theory, the Radeon HD 6770 1GB should perform just a bit faster than the Radeon HD 3870 512MB overall. (explain)
| Radeon HD 6770 1GB |
|
67200 MB/sec |
| Radeon HD 3870 512MB |
|
57600 MB/sec |
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Texel Rate
The Radeon HD 6770 1GB should be much (approximately 190%) faster with regards to texture filtering than the Radeon HD 3870 512MB. (explain)| Radeon HD 6770 1GB |
|
36000 Mtexels/sec |
| Radeon HD 3870 512MB |
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12400 Mtexels/sec |
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Pixel Rate
The Radeon HD 6770 1GB will be a small bit (more or less 16%) faster with regards to full screen anti-aliasing than the Radeon HD 3870 512MB, and also will be able to handle higher resolutions better. (explain)| Radeon HD 6770 1GB |
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14400 Mpixels/sec |
| Radeon HD 3870 512MB |
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12400 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.
Radeon HD 3870 512MBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Radeon HD 6770 1GBAmazon.com
Other US-based stores
Amazon.co.uk
Amazon.de
Amazon.fr
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Specifications
| Model | Radeon HD 3870 512MB | Radeon HD 6770 1GB |
|---|---|---|
| Manufacturer | ATi | ATi |
| Year | Nov 19, 2007 | January 2011 |
| Code Name | RV670 XT | Juniper XT |
| Fab Process | 55 nm | 40 nm |
| Bus | PCIe 2.0 x16/AGP 8x | PCIe x16 |
| Memory | 512 MB | 1024 MB |
| Core Speed | 775 MHz | 900 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 900 MHz | 1050 MHz |
| Unified Shaders | 320(64x5) | 800 |
| Texture Mapping Units | 16 | 40 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
| Power (Max TDP) | 106 watts | 108 watts |
| Shader Model | 4.1 | 5.0 |
| Bandwidth | 57600 MB/sec | 67200 MB/sec |
| Texel Rate | 12400 Mtexels/sec | 36000 Mtexels/sec |
| Pixel Rate | 12400 Mpixels/sec | 14400 Mpixels/sec |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are 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 this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the maximum amount of 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 Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.
Comments
One Response to “Radeon HD 3870 512MB vs Radeon HD 6770 1GB”Why can't I compare older cards with Radeon 7770 and 7750. its so DAMN frustrating.