ATI Mobility Radeon HD 3870 vs AMD Radeon HD 6870M

VS

ATI Mobility Radeon HD 3870

AMD Radeon HD 6870M

We compared two Mobile platform GPUs: 512MB VRAM Mobility Radeon HD 3870 and 1024MB VRAM Radeon HD 6870M 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 7 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 55W)

Score

Benchmark

FP32 (float)

Mobility Radeon HD 3870

0.422 TFLOPS

Radeon HD 6870M +155%

1.08 TFLOPS

Mobility Radeon HD 3870

VS

Radeon HD 6870M

Graphics Card

Jun 2008

Release Date

Jan 2011

M8x

Generation

Vancouver

Mobile

Type

Mobile

PCIe 2.0 x16

Bus Interface

MXM-B (3.0)

Clock Speeds

-

850 MHz

Memory Clock

1000 MHz

Memory

512MB

Memory Size

1024MB

GDDR3

Memory Type

GDDR5

256bit

Memory Bus

128bit

54.40GB/s

Bandwidth

64.00GB/s

Render Config

4

Compute Units

10

-

320

Shading Units

800

16

TMUs

40

16

ROPs

16

-

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

10.56 GPixel/s

Pixel Rate

10.80 GPixel/s

10.56 GTexel/s

Texture Rate

27.00 GTexel/s

-

422.4 GFLOPS

FP32 (float)

1080 GFLOPS

84.48 GFLOPS

FP64 (double)

-

Board Design

55W

TDP

50W

-

No outputs

Outputs

No outputs

-

Graphics Processor

M88

GPU Name

Granville

-

GPU Variant

Granville XT (216-0769024)

TeraScale

Architecture

TeraScale 2

TSMC

Foundry

TSMC

55 nm

Process Size

40 nm

0.666 billion

Transistors

1.04 billion

192 mm²

Die Size

166 mm²

Graphics Features

10.1 (10_1)

DirectX

11.2 (11_0)

3.3

OpenGL

4.4

N/A

OpenCL

1.2

N/A

Vulkan

N/A

-

4.1

Shader Model

5.0

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