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Features Key features of the Radeon HD 4855
memory bandwidth Rate at which data can be read from or stored in onboard memory
pixel rate Number of pixels a graphics card can render to the screen every second
texture rate Speed at which a graphics card can perform texture mapping
floating point performance How fast the gpu can crunch numbers
shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading
texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes
Specifications Full list of technical specs
gpu
| GPU brand | ATI |
|---|---|
| GPU name | RV770 |
| Market | Desktop |
| Clock speed | 575 MHz |
| Is dual GPU | No |
| Reference card | ATi Radeon HD 4855 575 MHz 512 MB |
raw performance
| Shading units | 640 |
|---|---|
| Texture mapping units | 32 |
| Render output processors | 16 |
| Compute units | 8 |
| Pixel rate | 9.2 GPixel/s |
| Texture rate | 18.4 GTexel/s |
| Floating-point performance | 736 GFLOPS |
memory
| Memory clock speed | 900 MHz |
|---|---|
| Effective memory clock speed | 3,600 MHz |
| Memory bus | 256 bit |
| Memory | 512 MB |
| Memory type | GDDR5 |
| Memory bandwidth | 115.2 GB/s |
noise and power
| TDP | 110W |
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Competitors
 | AMD Radeon HD 8470
|
 | AMD Radeon HD 7650
|
 | ATi Radeon HD 4670
|
 | Nvidia GeForce GT 9800
|
 | AMD Radeon HD 6850
|
 | AMD Radeon HD 7850
|
 | ATi Radeon HD 5850
|
Other Radeon HD 4855s
 | ATi Radeon HD 4855
|
 | Lantic Radeon HD 4855 1 GB
|
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