ATI Radeon HD 4830 vs ATI Radeon HD 4855
What is the difference between ATI Radeon HD 4830 and ATI Radeon HD 4855. Find out which graphics card has better performance.
Graphics Processor (GPU)
| RV770 | GPU Name | RV770 |
| RV770 LE (215-0669075) | Model number | RV770 PRO (215-0669065) |
| TeraScale | Architecture | TeraScale |
| TSMC | Foundry | TSMC |
| 55 nm | Process Size | 55 nm |
| 956 million | Transistors | 956 million |
| 256 mm² | Die Size | 256 mm² |
Graphics Card
| Oct 21st, 2008 | Release Date | Jan 3rd, 2010 |
| Radeon R700 (HD 4800) | Family | Radeon R700 (HD 4800) |
| End-of-life | Production | End-of-life |
| Radeon R600 | Predecessor | Radeon R600 |
| PCIe 2.0 x16 | Bus Interface | PCIe 2.0 x16 |
Memory
| 512 MB | Memory Size | 512 MB |
| GDDR3 | Memory Type | GDDR5 |
| 256 bit | Memory Bus | 256 bit |
| 57.60 GB/s | Bandwidth | 115.2 GB/s |
Performance
| 9.200 GPixel/s | Pixel fillrate | 9.200 GPixel/s |
| 18.40 GTexel/s | Texture fillrate | 18.40 GTexel/s |
| 736.0 GFLOPS | FP32 (float) performance | 736.0 GFLOPS |
| 147.2 GFLOPS (1:5) | FP64 (double) performance | 147.2 GFLOPS (1:5) |
Clock Speeds
| 900 MHz 1800 Mbps effective | Memory Clock | 900 MHz 3.6 Gbps effective |
| 575 MHz | GPU Clock | 575 MHz |
Render Config
| 640 | Shading Units | 640 |
| 32 | TMUs | 32 |
| 16 | ROPs | 16 |
| 8 | Compute Units | 8 |
| 16 KB (per CU) | L1 Cache | 16 KB (per CU) |
| 256 KB | L2 Cache | 256 KB |
Board Design
| Single-slot | Slot Width | Dual-slot |
| 246 mm 9.7 inches | Length | 220 mm 8.7 inches |
| 95 W | Thermal design power (TDP) | 110 W |
| 250 W | Suggested PSU | 300 W |
| 2x DVI 1x S-Video | Display Connectors | 1x DVI 1x HDMI 1x VGA |
| 1x 6-pin | Power Connectors | 1x 6-pin |
API support
| 10.1 (10_1) | DirectX | 10.1 (10_1) |
| 3.3 | OpenGL | 3.3 |
| 1.1 | OpenCL | 1.1 |
| N/A | Vulkan | N/A |
| 4.1 | Shader Model | 4.1 |