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Radeon HD 4850 512MB vs Radeon HD 6770 1GB
Intro
The Radeon HD 4850 512MB comes with a clock frequency of 625 MHz and a GDDR3 memory speed of 993 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.Compare all that to the Radeon HD 6770 1GB, which has a clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 TAUs, and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6770 1GB |
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108 Watts |
| Radeon HD 4850 512MB |
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110 Watts |
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Memory Bandwidth
In theory, the Radeon HD 6770 1GB should be 6% quicker than the Radeon HD 4850 512MB overall, because of its greater bandwidth. (explain)
| Radeon HD 6770 1GB |
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67200 MB/sec |
| Radeon HD 4850 512MB |
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63552 MB/sec |
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Texel Rate
The Radeon HD 6770 1GB will be much (approximately 44%) faster with regards to anisotropic filtering than the Radeon HD 4850 512MB. (explain)| Radeon HD 6770 1GB |
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36000 Mtexels/sec |
| Radeon HD 4850 512MB |
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25000 Mtexels/sec |
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Pixel Rate
If using high levels of AA is important to you, then the Radeon HD 6770 1GB is a better choice, and very much so. (explain)| Radeon HD 6770 1GB |
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14400 Mpixels/sec |
| Radeon HD 4850 512MB |
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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
Radeon HD 4850 512MBAmazon.com
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Radeon HD 6770 1GBAmazon.com
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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 | Radeon HD 4850 512MB | Radeon HD 6770 1GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jun 25, 2008 | January 2011 |
| Code Name | RV770 PRO | Juniper XT |
| Memory | 512 MB | 1024 MB |
| Core Speed | 625 MHz | 900 MHz |
| Memory Speed | 1986 MHz | 4200 MHz |
| Power (Max TDP) | 110 watts | 108 watts |
| Bandwidth | 63552 MB/sec | 67200 MB/sec |
| Texel Rate | 25000 Mtexels/sec | 36000 Mtexels/sec |
| Pixel Rate | 10000 Mpixels/sec | 14400 Mpixels/sec |
| Unified Shaders | 800(160x5) | 800 |
| Texture Mapping Units | 40 | 40 |
| Render Output Units | 16 | 16 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 256-bit | 128-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 956 million | 1040 million |
| Bus | PCIe 2.0 x16 | PCIe x16 |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.
Radeon HD 4850 512MBAmazon.com
Check prices at:
|
Radeon HD 6770 1GBAmazon.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 “Radeon HD 4850 512MB vs Radeon HD 6770 1GB”[...] #2 i would probably choose option 1, this is due to the faster graphic card. 1tb enough memory also. and if its an old mac there is a possibility to have a older cpu. thats just my opinion. Radeon HD 4850 512MB vs Radeon HD 6770 1GB – Performance Comparison Benchmarks @ Hardware Comp... [...]