GeForce GTX 660 and GeForce GT 640M - video card comparison

Passmark - benchmark score GeForce GTX 660 vs GeForce GT 640M

GeForce GTX 660

4119

GeForce GT 640M

946

GeForce GTX 660

GeForce GT 640M

Architecture

Kepler (2012−2018)

GPU code name

GK106

N13P-GS

Market segment

Desktop

Laptop

Release date

September 2012

March 2012

Bus support

PCI Express 3.0

PCI Express 2.0, PCI Express 3.0

Interface

PCIe 3.0 x16

Supplementary power connectors

One 6-pin

SLI options

Boost clock speed

1033 MHz

645 MHz

Core clock speed

980 MHz

Up to 625 MHz

CUDA cores

960

384

Floating-point performance

1,981 gflops

480.0 gflops

Manufacturing process technology

28 nm

Number of transistors

2,540 million

1,270 million

Pipelines / CUDA cores

960

384

Power consumption (TDP)

140 Watt

32 Watt

Texture fill rate

78.4 billion/sec

Up to 20.0 billion/sec

Memory type

GDDR5

DDR3\GDDR5

Maximum RAM amount

2 GB

Memory bus width

192-bit GDDR5

128bit

Memory clock speed

6.0 GB/s

1800 - 4000 MHz

Memory bandwidth

144.2 GB/s

Up to 64.0 GB/s

Shared memory

Display Connectors

One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort

No outputs

Multi monitor support

4 displays

HDMI

HDCP

Maximum VGA resolution

2048x1536

Up to 2048x1536

Audio input for HDMI

Internal

DirectX

12 (11_0)

12 API

CUDA

OpenCL

1.2

1.1

OpenGL

4.3

4.5

Shader Model

5.1

Vulkan

1.1.126

3D Blu-Ray

3D Gaming

3D Vision

Optimus