 |
 |
Radeon HD 6770 1GB vs Radeon HD 7870 XT
Intro
The Radeon HD 6770 1GB features a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It features 800 SPUs, 40 TAUs, and 16 ROPs.Compare those specifications to the Radeon HD 7870 XT, which uses a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 memory works at a frequency of 1500 MHz on this specific card. It features 1536 SPUs as well as 96 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6770 1GB |
|
108 Watts |
| Radeon HD 7870 XT |
|
185 Watts |
|
|
Memory Bandwidth
The Radeon HD 7870 XT should theoretically perform a lot faster than the Radeon HD 6770 1GB overall. (explain)
| Radeon HD 7870 XT |
|
192000 MB/sec |
| Radeon HD 6770 1GB |
|
67200 MB/sec |
|
|
Texel Rate
The Radeon HD 7870 XT is a lot (more or less 147%) more effective at AF than the Radeon HD 6770 1GB. (explain)| Radeon HD 7870 XT |
|
88800 Mtexels/sec |
| Radeon HD 6770 1GB |
|
36000 Mtexels/sec |
|
|
Pixel Rate
The Radeon HD 7870 XT should be a lot (more or less 106%) better at AA than the Radeon HD 6770 1GB, and also capable of handling higher resolutions while still performing well. (explain)| Radeon HD 7870 XT |
|
29600 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.
Price Comparison
Radeon HD 6770 1GBAmazon.com
Check prices at:
|
Radeon HD 7870 XTAmazon.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 6770 1GB | Radeon HD 7870 XT |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | January 2011 | November 2012 |
| Code Name | Juniper XT | Tahiti LE |
| Memory | 1024 MB | 2048 MB |
| Core Speed | 900 MHz | 925 MHz |
| Memory Speed | 4200 MHz | 6000 MHz |
| Power (Max TDP) | 108 watts | 185 watts |
| Bandwidth | 67200 MB/sec | 192000 MB/sec |
| Texel Rate | 36000 Mtexels/sec | 88800 Mtexels/sec |
| Pixel Rate | 14400 Mpixels/sec | 29600 Mpixels/sec |
| Unified Shaders | 800 | 1536 |
| Texture Mapping Units | 40 | 96 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 128-bit | 256-bit |
| Fab Process | 40 nm | 28 nm |
| Transistors | 1040 million | 4313 million |
| Bus | PCIe x16 | PCIe 3.0 x16 |
| DirectX Version | DirectX 11 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.3 |
Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.
Radeon HD 6770 1GBAmazon.com
Check prices at:
|
Radeon HD 7870 XTAmazon.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
Be the first to leave a comment!