 |
 |
Radeon HD 4870 X2 vs Radeon HD 6770 1GB
Intro
The Radeon HD 4870 X2 uses a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM runs at a speed of 900 MHz on this model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.Compare those specs to the Radeon HD 6770 1GB, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs as well as 40 TAUs and 16 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6770 1GB |
|
108 Watts |
| Radeon HD 4870 X2 |
|
350 Watts |
|
|
Memory Bandwidth
Theoretically speaking, the Radeon HD 4870 X2 should be a lot faster than the Radeon HD 6770 1GB overall. (explain)
| Radeon HD 4870 X2 |
|
230400 MB/sec |
| Radeon HD 6770 1GB |
|
67200 MB/sec |
|
|
Texel Rate
The Radeon HD 4870 X2 should be a lot (approximately 67%) faster with regards to anisotropic filtering than the Radeon HD 6770 1GB. (explain)| Radeon HD 4870 X2 |
|
60000 Mtexels/sec |
| Radeon HD 6770 1GB |
|
36000 Mtexels/sec |
|
|
Pixel Rate
If running with a high screen resolution is important to you, then the Radeon HD 4870 X2 is the winner, by a large margin. (explain)| Radeon HD 4870 X2 |
|
24000 Mpixels/sec |
| Radeon HD 6770 1GB |
|
14400 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.
One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.
Price Comparison
Radeon HD 4870 X2Amazon.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.
Specifications
| Model | Radeon HD 4870 X2 | Radeon HD 6770 1GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Aug 12, 2008 | January 2011 |
| Code Name | R700 | Juniper XT |
| Memory | 1024 MB (x2) | 1024 MB |
| Core Speed | 750 MHz (x2) | 900 MHz |
| Memory Speed | 3600 MHz (x2) | 4200 MHz |
| Power (Max TDP) | 350 watts | 108 watts |
| Bandwidth | 230400 MB/sec | 67200 MB/sec |
| Texel Rate | 60000 Mtexels/sec | 36000 Mtexels/sec |
| Pixel Rate | 24000 Mpixels/sec | 14400 Mpixels/sec |
| Unified Shaders | 800(160x5) (x2) | 800 |
| Texture Mapping Units | 40 (x2) | 40 |
| Render Output Units | 16 (x2) | 16 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit (x2) | 128-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 956 million | 1040 million |
| Bus | PCIe 2.0 x16 (PCIe bridge) | PCIe x16 |
| DirectX Version | DirectX 10.1 | DirectX 11 |
| OpenGL Version | OpenGL 3.0 | OpenGL 4.1 |
Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 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 anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total 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 processed in one second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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 potential to reach the maximum fill rate.
Radeon HD 4870 X2Amazon.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 4870 X2 vs Radeon HD 6770 1GB”I'm surprised to see the benchmarks like this because I'm waaaaaaay more impressed with the way two CrossfireX 6770's work than the one 4870 x2 did in my system... oh well... anyone who wants a 4870 x2 can check out E-Bay now.