 |
 |
|
|
|
Radeon HD 7870 vs Radeon HD 7950 3GB
Intro
The Radeon HD 7870 has clock speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs along with 80 Texture Address Units and 32 ROPs.Compare those specifications to the Radeon HD 7950 3GB, which has a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It is made up of 1792 SPUs, 112 Texture Address Units, and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 7870 |
|
175 Watts |
| Radeon HD 7950 3GB |
|
200 Watts |
|
|
Memory Bandwidth
In theory, the Radeon HD 7950 3GB should perform quite a bit faster than the Radeon HD 7870 overall. (explain)
| Radeon HD 7950 3GB |
|
240000 MB/sec |
| Radeon HD 7870 |
|
153600 MB/sec |
|
|
Texel Rate
The Radeon HD 7950 3GB is a little bit (more or less 12%) more effective at AF than the Radeon HD 7870. (explain)| Radeon HD 7950 3GB |
|
89600 Mtexels/sec |
| Radeon HD 7870 |
|
80000 Mtexels/sec |
|
|
Pixel Rate
The Radeon HD 7870 will be quite a bit (about 25%) better at anti-aliasing than the Radeon HD 7950 3GB, and also will be able to handle higher screen resolutions without losing too much performance. (explain)| Radeon HD 7870 |
|
32000 Mpixels/sec |
| Radeon HD 7950 3GB |
|
25600 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 7870Amazon.com
|
Radeon HD 7950 3GBAmazon.com
|
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 7870 | Radeon HD 7950 3GB |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | March 2012 | January 2012 |
| Code Name | Pitcairn XT | Tahiti Pro |
| Fab Process | 28 nm | 28 nm |
| Bus | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Memory | 2048 MB | 3072 MB |
| Core Speed | 1000 MHz | 800 MHz |
| Shader Speed | N/A MHz | (N/A) MHz |
| Memory Speed | 1200 MHz (4800 MHz effective) | 1250 MHz (5000 MHz effective) |
| Unified Shaders | 1280 | 1792 |
| Texture Mapping Units | 80 | 112 |
| Render Output Units | 32 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 384-bit |
| DirectX Version | DirectX 11.1 | DirectX 11.1 |
| OpenGL Version | OpenGL 4.2 | OpenGL 4.2 |
| Power (Max TDP) | 175 watts | 200 watts |
| Shader Model | 5.0 | 5.0 |
| Bandwidth | 153600 MB/sec | 240000 MB/sec |
| Texel Rate | 80000 Mtexels/sec | 89600 Mtexels/sec |
| Pixel Rate | 32000 Mpixels/sec | 25600 Mpixels/sec |
Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.
Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.
Comments
2 Responses to “Radeon HD 7870 vs Radeon HD 7950 3GB”Thanks a lot in advance!