ATI Radeon HD 4855: GPU Specs & Benchmarks
The Radeon HD 4855 is a graphics card by ATI, built on the 55 nm process and based on the RV770 graphics processor (GPU). The video card specifications and performance tests (benchmarks) are listed below.
Recommended Gaming Resolutions 640x480 1280x720 1366x768 1600x900 1920x1080 2560x1440 3840x2160
Graphics Processor (GPU)
- GPU Name
- RV770
- Model number
- RV770 PRO
(215-0669065) - Architecture
- TeraScale
- Foundry
- TSMC
- Process Size
- 55 nm
- Transistors
- 956 million
- Die Size
- 256 mm²
Graphics Card
- Release Date
- Jan 3rd, 2010
- Family
- Radeon R700
(HD 4800) - Production
- End-of-life
- Predecessor
- Radeon R600
- Bus Interface
- PCIe 2.0 x16
Memory
- Memory Size
- 512 MB
- Memory Type
- GDDR5
- Memory Bus
- 256 bit
- Bandwidth
- 115.2 GB/s
Performance
- Pixel fillrate
- 9.200 GPixel/s
- Texture fillrate
- 18.40 GTexel/s
- FP32 (float) performance
- 736.0 GFLOPS
- FP64 (double) performance
- 147.2 GFLOPS (1:5)
Clock Speeds
- Memory Clock
- 900 MHz
3.6 Gbps effective - GPU Clock
- 575 MHz
Render Config
- Shading Units
- 640
- TMUs
- 32
- ROPs
- 16
- Compute Units
- 8
- L1 Cache
- 16 KB (per CU)
- L2 Cache
- 256 KB
Board Design
- Slot Width
- Dual-slot
- Length
- 220 mm
8.7 inches - Thermal design power (TDP)
- 110 W
- Suggested PSU
- 300 W
- Display Connectors
- 1x DVI
1x HDMI
1x VGA - Power Connectors
- 1x 6-pin
API support
- DirectX
- 10.1 (10_1)
- OpenGL
- 3.3
- OpenCL
- 1.1
- Vulkan
- N/A
- Shader Model
- 4.1