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Lantic HD 4855 1 GB

  • A4855D5-1GDVH-TOP
Graphics Processor
RV770
Cores
640
TMUs
32
ROPs
16
Memory Size
1024 MB
Memory Type
GDDR5
Bus Width
256 bit

Graphics Processor

GPU Name
RV770
GPU Variant
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
Generation
Radeon R700
(HD 4800)
Predecessor
Radeon R600
Successor
Evergreen
Production
End-of-life
Bus Interface
PCIe 2.0 x16

Clock Speeds

GPU Clock
575 MHz
625 MHz (+9%)
Memory Clock
900 MHz
3.6 Gbps effective

Memory

Memory Size
512 MB
1024 MB
Memory Type
GDDR5
Memory Bus
256 bit
Bandwidth
115.2 GB/s

Render Config

Shading Units
640
TMUs
32
ROPs
16
Compute Units
8
L1 Cache
16 KB (per CU)
L2 Cache
256 KB

Theoretical Performance

Pixel Rate
9.200 GPixel/s
10.00 GPixel/s
Texture Rate
18.40 GTexel/s
20.00 GTexel/s
FP32 (float) performance
736.0 GFLOPS
800.0 GFLOPS
FP64 (double) performance
147.2 GFLOPS
160.0 GFLOPS (1:5)

Board Design

Slot Width
Dual-slot
TDP
110 W
Suggested PSU
300 W
Outputs
1x DVI
1x HDMI
1x VGA
Power Connectors
1x 6-pin

Graphics Features

DirectX
10.1 (10_1)
OpenGL
3.3
OpenCL
1.1
Vulkan
N/A
Shader Model
4.1

Card Notes

Lantic Exclusive

Rebranded HD 4830 with a HD 4870 PCB

RV770 GPU Notes

Codename: Wekiva
Graphics/Compute: GFX3
Display Core Engine: 3.1
Unified Video Decoder: 2.0

Other retail boards based on this design (2)

Name GPU Clock Memory Clock Other Changes
Lantic HD 4855 575 MHz 900 MHz
Lantic HD 4855 1 GB 625 MHz 900 MHz 1024 MB
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