ATI Radeon HD 4870 vs ATI Radeon HD 4855

VS

ATI Radeon HD 4870

ATI Radeon HD 4855

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4870 and 512MB VRAM Radeon HD 4855 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 4870 's Advantages

160 additional rendering cores

ATI Radeon HD 4855 's Advantages

Released 1 years and 7 months late

Lower TDP (110W vs 150W)

Score

Benchmark

FP32 (float)

Radeon HD 4870 +63%

1.2 TFLOPS

Radeon HD 4855

0.736 TFLOPS

Radeon HD 4870

VS

Radeon HD 4855

Graphics Card

Jun 2008

Release Date

Jan 2010

Radeon R700

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

900 MHz

Memory Clock

900 MHz

Memory

512MB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

115.2GB/s

Bandwidth

115.2GB/s

Render Config

10

Compute Units

8

-

800

Shading Units

640

40

TMUs

32

16

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

12.00 GPixel/s

Pixel Rate

9.200 GPixel/s

30.00 GTexel/s

Texture Rate

18.40 GTexel/s

-

1200 GFLOPS

FP32 (float)

736.0 GFLOPS

240.0 GFLOPS

FP64 (double)

147.2 GFLOPS

Board Design

150W

TDP

110W

450 W

Suggested PSU

300 W

2x DVI 1x S-Video

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

2x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

RV770

GPU Name

RV770

RV770 XT (215-0669049)

GPU Variant

RV770 PRO (215-0669065)

TeraScale

Architecture

TeraScale

TSMC

Foundry

TSMC

55 nm

Process Size

55 nm

0.956 billion

Transistors

0.956 billion

256 mm²

Die Size

256 mm²

Graphics Features

10.1 (10_1)

DirectX

10.1 (10_1)

3.3

OpenGL

3.3

1.1

OpenCL

1.1

N/A

Vulkan

N/A

-

4.1

Shader Model

4.1

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