 |
 |
Radeon HD 4870 1GB vs Radeon HD 6870
Intro
The Radeon HD 4870 1GB comes with core speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.Compare those specs to the Radeon HD 6870, which has a core clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is comprised of 1120 SPUs, 56 Texture Address Units, and 32 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 4870 1GB |
|
150 Watts |
| Radeon HD 6870 |
|
151 Watts |
|
|
Memory Bandwidth
Theoretically, the Radeon HD 6870 should be a small bit faster than the Radeon HD 4870 1GB overall. (explain)
| Radeon HD 6870 |
|
134400 MB/sec |
| Radeon HD 4870 1GB |
|
115200 MB/sec |
|
|
Texel Rate
The Radeon HD 6870 is a lot (approximately 68%) faster with regards to AF than the Radeon HD 4870 1GB. (explain)| Radeon HD 6870 |
|
50400 Mtexels/sec |
| Radeon HD 4870 1GB |
|
30000 Mtexels/sec |
|
|
Pixel Rate
The Radeon HD 6870 is much (about 140%) more effective at FSAA than the Radeon HD 4870 1GB, and also should be capable of handling higher resolutions without losing too much performance. (explain)| Radeon HD 6870 |
|
28800 Mpixels/sec |
| Radeon HD 4870 1GB |
|
12000 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 4870 1GBAmazon.com
Check prices at:
|
Radeon HD 6870Amazon.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 1GB | Radeon HD 6870 |
|---|---|---|
| Manufacturer | AMD | AMD |
| Year | Jun 25, 2008 | October 2010 |
| Code Name | RV770 XT | Barts XT |
| Memory | 1024 MB | 1024 MB |
| Core Speed | 750 MHz | 900 MHz |
| Memory Speed | 3600 MHz | 4200 MHz |
| Power (Max TDP) | 150 watts | 151 watts |
| Bandwidth | 115200 MB/sec | 134400 MB/sec |
| Texel Rate | 30000 Mtexels/sec | 50400 Mtexels/sec |
| Pixel Rate | 12000 Mpixels/sec | 28800 Mpixels/sec |
| Unified Shaders | 800(160x5) | 1120 |
| Texture Mapping Units | 40 | 56 |
| Render Output Units | 16 | 32 |
| Bus Type | GDDR5 | GDDR5 |
| Bus Width | 256-bit | 256-bit |
| Fab Process | 55 nm | 40 nm |
| Transistors | 956 million | 1700 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 largest amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 number is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.
Radeon HD 4870 1GBAmazon.com
Check prices at:
|
Radeon HD 6870Amazon.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 1GB vs Radeon HD 6870”[...] Einiges an Hardware... nachfolger sind in der regel immer besser Radeon HD 4870 1GB vs Radeon HD 6870 – Performance Comparison Benchmarks @ Hardware Compare dadazu kommt noch das die 6870 nicht nur schneller sondern auch mehr futures hat DirectX11 usw. [...]