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Spec Radeon HD 4855 ATI
Overview
Product name ATI Radeon HD 4855
Architecture TeraScale
Generation / family Radeon HD 4000 Series
Launch date 2010-01-03
Market segment Gaming
Board type / entry type Reference GPU
GPU
Process node TSMC 55 nm
Die size 256 mm²
Transistor count 0.96 billion
GPU chip RV770
Stream Processors 640
ROPs 16
TMUs 32
Clocks
Base / Core clock 575 MHz
Boost clock 575 MHz
Memory clock 900 MHz
Memory
Memory size 512 MB
Memory type GDDR5
Memory bus width 256-bit
Memory bandwidth 115.2 GB/s
Bus / Interface
Bus interface PCIe 2.0 x16
AGP / PCI / PCIe distinction PCIe
Power
TDP / TBP / board power 110 W
Recommended PSU 300 W
Slot width Dual-slot
Display / Media
Display outputs 1x DVI, 1x HDMI 1.3a, 1x VGA
Features
DirectX support DirectX 10.1
OpenGL support OpenGL 3.3
Shader Model 4.1
Performance / Benchmarks
FP32 throughput 0.74 TFLOPS

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