AMD Radeon HD 7870 GHz Edition vs ATI Radeon HD 4855

VS

AMD Radeon HD 7870 GHz Edition

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 7870 GHz Edition 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 HD 7870 GHz Edition 's Advantages

Released 2 years and 2 months late

More VRAM (2GB vs 512GB)

Larger VRAM bandwidth (153.6GB/s vs 115.2GB/s)

640 additional rendering cores

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 175W)

Score

Benchmark

FP32 (float)

Radeon HD 7870 GHz Edition +247%

2.56 TFLOPS

Radeon HD 4855

0.736 TFLOPS

Radeon HD 7870 GHz Edition

VS

Radeon HD 4855

Graphics Card

Mar 2012

Release Date

Jan 2010

Southern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1200 MHz

Memory Clock

900 MHz

Memory

2GB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

153.6GB/s

Bandwidth

115.2GB/s

Render Config

20

Compute Units

8

-

1280

Shading Units

640

80

TMUs

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

9.200 GPixel/s

80.00 GTexel/s

Texture Rate

18.40 GTexel/s

-

2.560 TFLOPS

FP32 (float)

736.0 GFLOPS

160.0 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

175W

TDP

110W

450 W

Suggested PSU

300 W

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

2x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

Pitcairn

GPU Name

RV770

Pitcairn XT (215-0828047)

GPU Variant

RV770 PRO (215-0669065)

GCN 1.0

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

2.8 billion

Transistors

0.956 billion

212 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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