AMD Radeon HD 6990M vs ATI Mobility Radeon HD 3870 X2

VS

AMD Radeon HD 6990M

ATI Mobility Radeon HD 3870 X2

We compared two Mobile platform GPUs: 2GB VRAM Radeon HD 6990M 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 6990M 's Advantages

Released 2 years and 10 months late

More VRAM (2GB vs 512GB)

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

800 additional rendering cores

Lower TDP (100W vs 110W)

Score

Benchmark

FP32 (float)

Radeon HD 6990M +279%

1.602 TFLOPS

Mobility Radeon HD 3870 X2

0.422 TFLOPS

Radeon HD 6990M

VS

Mobility Radeon HD 3870 X2

Graphics Card

Jul 2011

Release Date

Sep 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

14

Compute Units

4

-

1120

Shading Units

320

56

TMUs

16

32

ROPs

16

-

8 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

256 KB

-

Theoretical Performance

22.88 GPixel/s

Pixel Rate

10.56 GPixel/s

40.04 GTexel/s

Texture Rate

10.56 GTexel/s

-

1.602 TFLOPS

FP32 (float)

422.4 GFLOPS

-

FP64 (double)

84.48 GFLOPS

Board Design

100W

TDP

110W

-

No outputs

Outputs

No outputs

None

Power Connectors

-

Graphics Processor

Blackcomb

GPU Name

M88

Blackcomb XTX (216-0811030)

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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