ATI Radeon HD 4855 vs ATI Radeon HD 4870 X2

VS

ATI Radeon HD 4855 ATI Radeon HD 4870 X2

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 4855 and 1024MB VRAM Radeon HD 4870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 4855 's Advantages

Released 1 years and 5 months late

Lower TDP (110W vs 286W)

ATI Radeon HD 4870 X2 's Advantages

More VRAM (1024GB vs 512GB)

160 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 4855

0.736 TFLOPS

Radeon HD 4870 X2 +63%

1.2 TFLOPS

Radeon HD 4855

VS

Radeon HD 4870 X2

Graphics Card

Jan 2010

Release Date

Aug 2008

Radeon R700

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

900 MHz

Memory Clock

900 MHz

Memory

512MB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

115.2GB/s

Bandwidth

115.2GB/s

Render Config

-

SM Count

-

8

Compute Units

10

640

Shading Units

800

32

TMUs

40

16

ROPs

16

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

Theoretical Performance

9.200 GPixel/s

Pixel Rate

12.00 GPixel/s

18.40 GTexel/s

Texture Rate

30.00 GTexel/s

-

FP16 (half)

-

736.0 GFLOPS

FP32 (float)

1200 GFLOPS

147.2 GFLOPS

FP64 (double)

240.0 GFLOPS

Graphics Processor

RV770

GPU Name

R700

RV770 PRO (215-0669065)

GPU Variant

R700 XT (215-0669045)

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

Board Design

110W

TDP

286W

300 W

Suggested PSU

600 W

1x DVI 1x HDMI 1.3a 1x VGA

Outputs

2x DVI 1x S-Video

1x 6-pin

Power Connectors

1x 6-pin + 1x 8-pin

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

-

CUDA

-

4.1

Shader Model

4.1

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