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.

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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