AMD Radeon HD 6870M vs ATI Mobility Radeon HD 3870 X2

VS

AMD Radeon HD 6870M

ATI Mobility Radeon HD 3870 X2

We compared two Mobile platform GPUs: 1024MB VRAM Radeon HD 6870M and 512MB VRAM Mobility Radeon HD 3870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870M 's Advantages

Released 2 years and 4 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (64.00GB/s vs 54.40GB/s)

480 additional rendering cores

Lower TDP (50W vs 110W)

Score

Benchmark

FP32 (float)

Radeon HD 6870M +155%

1.08 TFLOPS

Mobility Radeon HD 3870 X2

0.422 TFLOPS

Radeon HD 6870M

VS

Mobility Radeon HD 3870 X2

Graphics Card

Jan 2011

Release Date

Sep 2008

Vancouver

Generation

M8x

Mobile

Type

Mobile

MXM-B (3.0)

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1000 MHz

Memory Clock

850 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

128bit

Memory Bus

256bit

64.00GB/s

Bandwidth

54.40GB/s

Render Config

10

Compute Units

4

-

800

Shading Units

320

40

TMUs

16

ROPs

16

-

8 KB (per CU)

L1 Cache

-

256 KB

L2 Cache

256 KB

-

Theoretical Performance

10.80 GPixel/s

Pixel Rate

10.56 GPixel/s

27.00 GTexel/s

Texture Rate

10.56 GTexel/s

-

1080 GFLOPS

FP32 (float)

422.4 GFLOPS

-

FP64 (double)

84.48 GFLOPS

Board Design

50W

TDP

110W

-

No outputs

Outputs

No outputs

-

Graphics Processor

Granville

GPU Name

M88

Granville XT (216-0769024)

GPU Variant

-

TeraScale 2

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

1.04 billion

Transistors

0.666 billion

166 mm²

Die Size

192 mm²

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3

1.2

OpenCL

N/A

Vulkan

N/A

-

5.0

Shader Model

4.1

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