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
Radeon HD 4855
ATI Radeon HD 4855: GPU Specs & Benchmarks