ATI Radeon HD 4855 vs AMD Radeon HD 6870

VS

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4855 and 1024MB VRAM Radeon HD 6870 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 151W)

AMD Radeon HD 6870 's Advantages

Released 9 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (134.4GB/s vs 115.2GB/s)

480 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 4855

0.736 TFLOPS

Radeon HD 6870 +173%

2.016 TFLOPS

Radeon HD 4855

VS

Radeon HD 6870

Graphics Card

Jan 2010

Release Date

Oct 2010

Radeon R700

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

900 MHz

Memory Clock

1050 MHz

Memory

512MB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

115.2GB/s

Bandwidth

134.4GB/s

Render Config

-

SM Count

-

8

Compute Units

14

640

Shading Units

1120

32

TMUs

56

16

ROPs

32

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

Theoretical Performance

9.200 GPixel/s

Pixel Rate

28.80 GPixel/s

18.40 GTexel/s

Texture Rate

50.40 GTexel/s

-

FP16 (half)

-

736.0 GFLOPS

FP32 (float)

2.016 TFLOPS

147.2 GFLOPS

FP64 (double)

-

Graphics Processor

RV770

GPU Name

Barts

RV770 PRO (215-0669065)

GPU Variant

Barts XT (215-0798000)

TeraScale

Architecture

TeraScale 2

TSMC

Foundry

TSMC

55 nm

Process Size

40 nm

0.956 billion

Transistors

1.7 billion

256 mm²

Die Size

255 mm²

Board Design

110W

TDP

151W

300 W

Suggested PSU

450 W

1x DVI 1x HDMI 1.3a 1x VGA

Outputs

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

1x 6-pin

Power Connectors

2x 6-pin

Graphics Features

10.1 (10_1)

DirectX

11.2 (11_0)

3.3

OpenGL

4.4

1.1

OpenCL

1.2

N/A

Vulkan

N/A

-

CUDA

-

4.1

Shader Model

5.0

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