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Radeon HD 4855 / A4855D5-1GDVH TOP

Specifications of the Lantic Radeon HD 4855 GPU


Lantic Radeon HD 4855 (part number A4855D5-1GDVH TOP) is a Graphics Processing Unit for desktop market segment, based on ATI Radeon HD 4855. The GPU, fabricated on 55 nm manufacturing process, utilizes Unified Superscalar Shader architecture. The card has 625 MHz graphics clock frequency. Furthermore, it has 640 stream processors, 32 texture units, along with 16 color ROPs. The Radeon HD 4855 comes with 512 MB of GDDR5 memory. Because the memory runs at 900 MHz, and uses 256 bit bus, the effective memory bandwidth is 115.2 GB/s. The GPU supports PCI Express 2.0 interface, and needs 2 motherboard slots. The maximum power draw of this model is 110 Watt, same as on the reference design.

Below you will find more detailed specs of the Lantic Radeon HD 4855 graphics card.

Name / Brand / Architecture

Manufacturer:Lantic
Model:Radeon HD 4855
Part number:A4855D5-1GDVH TOP
Based on:ATI Radeon HD 4855 [Compare]
Target market segment:Desktop
Die name:RV770 Pro
Architecture:Unified Superscalar Shader Architecture
Fabrication process:55 nm
Transistors:956 million
Bus interface:PCI-E 2.0 x 16

Frequency

Graphics clock:625 MHz

Memory specifications

Memory size:** MB
Memory type:GDDR5
Memory clock:900 MHz
Memory clock (effective):3600 MHz
Memory interface width:**-bit
Memory bandwidth:115.2 GB/s

Cores / Texture

Color ROPs:16
Stream processors:**0
Texture units:32
RAMDACs:400 MHz
Decoders:DivX
H.2**
MPEG 1
MPEG-2
VC-1

SLI / Crossfire

Maximum crossfire options:4-way

Electric characteristics

Maximum power draw:110 W

Video features

Multi-monitor:Up to 2 displays
Maximum digital resolution:**0 x 1600
Maximum DVI resolution:**0 x 1600
Maximum HDMI resolution:**0 x 1600
Maximum VGA resolution:2048 x 1536
Anti-Aliasing technologies:24 x CFAA
8 x MSAA
Adaptive MSAA & SSAA
HDMI:Yes
HDMI version:1.3

Performance

Pixel fill rate:10 Gigapixels/s
Texture fill rate:20 Gigatexels/s
Single presision compute power:800 GFLOPS
Double precision compute power:160 GFLOPS

External connectors

Standard display connectors:Dual-Link DVI-I
HDMI
VGA
Power connectors:1 x 6-pin
Audio input for HDMI:Yes

Dimensions

Size (length x height):8.66 inches (220 mm) x 5.12 inches (130 mm)
Width:Dual-Slot

Other features / Support

Other features:ATI/AMD PowerPlay
HDCP
High Dynamic Range (HDR) Support
Open CL support:1.0
OpenGL support:3.3
DirectX support:10.1
Shader model:4.1
Windows driver support:Windows 7
Windows Vista
Windows XP
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