AMD Radeon HD 6870 1600SP Edition vs ATI Radeon HD 4855

VS

AMD Radeon HD 6870 1600SP Edition ATI Radeon HD 4855

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 1600SP 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 6870 1600SP Edition 's Advantages

Released 3 years late

More VRAM (1024GB vs 512GB)

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

960 additional rendering cores

ATI Radeon HD 4855 's Advantages

Lower TDP (110W vs 175W)

Score

Benchmark

FP32 (float)

Radeon HD 6870 1600SP Edition +269%

2.72 TFLOPS

Radeon HD 4855

0.736 TFLOPS

Radeon HD 6870 1600SP Edition

VS

Radeon HD 4855

Graphics Card

Jan 2013

Release Date

Jan 2010

Northern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

1050 MHz

Memory Clock

900 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

134.4GB/s

Bandwidth

115.2GB/s

Render Config

-

SM Count

-

20

Compute Units

8

1600

Shading Units

640

80

TMUs

32

ROPs

16

-

Tensor Cores

-

RT Cores

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

256 KB

Theoretical Performance

27.20 GPixel/s

Pixel Rate

9.200 GPixel/s

68.00 GTexel/s

Texture Rate

18.40 GTexel/s

-

FP16 (half)

-

2.720 TFLOPS

FP32 (float)

736.0 GFLOPS

544.0 GFLOPS

FP64 (double)

147.2 GFLOPS

Graphics Processor

Cypress

GPU Name

RV770

Cypress XT (215-0735033)

GPU Variant

RV770 PRO (215-0669065)

TeraScale 2

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

2.154 billion

Transistors

0.956 billion

334 mm²

Die Size

256 mm²

Board Design

175W

TDP

110W

450 W

Suggested PSU

300 W

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

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

2x 6-pin

Power Connectors

1x 6-pin

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3

1.2

OpenCL

1.1

N/A

Vulkan

N/A

-

CUDA

-

5.0

Shader Model

4.1

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