AMD Radeon Sky 900 vs ATI Radeon HD 4855

VS

AMD Radeon Sky 900

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 3GB VRAM Radeon Sky 900 and 512MB VRAM Radeon HD 4855 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon Sky 900 's Advantages

Released 3 years and 2 months late

Boost Clock950MHz

More VRAM (3GB vs 512GB)

Larger VRAM bandwidth (240.0GB/s vs 115.2GB/s)

1152 additional rendering cores

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 300W)

Score

Benchmark

FP32 (float)

Radeon Sky 900 +362%

3.405 TFLOPS

Radeon HD 4855

0.736 TFLOPS

Radeon Sky 900

VS

Radeon HD 4855

Graphics Card

Mar 2013

Release Date

Jan 2010

Radeon Sky

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

825 MHz

Base Clock

-

950 MHz

Boost Clock

-

1250 MHz

Memory Clock

900 MHz

Memory

3GB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

240.0GB/s

Bandwidth

115.2GB/s

Render Config

28

Compute Units

8

-

1792

Shading Units

640

112

TMUs

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

256 KB

-

Theoretical Performance

30.40 GPixel/s

Pixel Rate

9.200 GPixel/s

106.4 GTexel/s

Texture Rate

18.40 GTexel/s

-

3.405 TFLOPS

FP32 (float)

736.0 GFLOPS

851.2 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

300W

TDP

110W

700 W

Suggested PSU

300 W

1x DVI 1x mini-DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Tahiti

GPU Name

RV770

Orthrus

GPU Variant

RV770 PRO (215-0669065)

GCN 1.0

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

4.313 billion

Transistors

0.956 billion

352 mm²

Die Size

256 mm²

Graphics Features

12 (11_1)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

1.2

OpenCL

1.1

1.2

Vulkan

N/A

-

5.1

Shader Model

4.1

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