AMD Radeon HD 6970M Mac Edition vs ATI Mobility Radeon HD 3870

VS

AMD Radeon HD 6970M Mac Edition

ATI Mobility Radeon HD 3870

We compared two Mobile platform GPUs: 2GB VRAM Radeon HD 6970M Mac Edition and 512MB VRAM Mobility Radeon HD 3870 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6970M Mac Edition 's Advantages

Released 3 years and 2 months late

More VRAM (2GB vs 512GB)

Larger VRAM bandwidth (115.2GB/s vs 54.40GB/s)

640 additional rendering cores

ATI Mobility Radeon HD 3870 's Advantages

Lower TDP (55W vs 75W)

Score

Benchmark

FP32 (float)

Radeon HD 6970M Mac Edition +209%

1.306 TFLOPS

Mobility Radeon HD 3870

0.422 TFLOPS

Radeon HD 6970M Mac Edition

VS

Mobility Radeon HD 3870

Graphics Card

Aug 2011

Release Date

Jun 2008

Vancouver

Generation

M8x

Mobile

Type

Mobile

MXM-B (3.0)

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

900 MHz

Memory Clock

850 MHz

Memory

2GB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

256bit

Memory Bus

256bit

115.2GB/s

Bandwidth

54.40GB/s

Render Config

12

Compute Units

4

-

960

Shading Units

320

48

TMUs

16

32

ROPs

16

-

8 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

256 KB

-

Theoretical Performance

21.76 GPixel/s

Pixel Rate

10.56 GPixel/s

32.64 GTexel/s

Texture Rate

10.56 GTexel/s

-

1306 GFLOPS

FP32 (float)

422.4 GFLOPS

-

FP64 (double)

84.48 GFLOPS

Board Design

75W

TDP

55W

-

No outputs

Outputs

No outputs

None

Power Connectors

-

Graphics Processor

Blackcomb

GPU Name

M88

Blackcomb XT (216-0811000)

GPU Variant

-

TeraScale 2

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

1.7 billion

Transistors

0.666 billion

212 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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