GeForce GTX 660M and Radeon HD 6970M X2 - video card comparison

GeForce GTX 660M

Radeon HD 6970M X2

Architecture

Kepler (2012−2018)

TeraScale 2 (2009−2015)

GPU code name

N13E-GE

Blackcomb

Market segment

Laptop

Desktop

Release date

March 2012

January 2011

Bus support

PCI Express 2.0, PCI Express 3.0

-

Interface

MXM-B (3.0)

MXM-B (3.0)

Supplementary power connectors

-

None

SLI options

+

-

Boost clock speed

950 MHz

-

Core clock speed

835 MHz

680 MHz

CUDA cores

384

-

Floating-point performance

729.6 gflops

-

Manufacturing process technology

28 nm

40 nm

Number of transistors

1,270 million

1,700 million

Pipelines / CUDA cores

384

960

Power consumption (TDP)

50 Watt

150 Watt

Texture fill rate

30.4 billion/sec

32.64

Memory type

GDDR5

GDDR5

Maximum RAM amount

2 GB

2 GB

Memory bus width

128bit

256 Bit

Memory clock speed

2000 MHz

3.6 GB/s

Memory bandwidth

64.0 GB/s

115.2 GB/s

Shared memory

-

-

Display Connectors

No outputs

Portable Device Dependent

HDMI

+

-

HDCP

+

-

Maximum VGA resolution

Up to 2048x1536

-

DirectX

12 API

11.2 (11_0)

CUDA

+

-

OpenCL

1.1

1.2

OpenGL

4.5

4.4

Shader Model

5.1

5.0

Vulkan

1.1.126

N/A

Optimus

+

-