GeForce 940M and GeForce GT 645 OEM - video card comparison

GeForce 940M

GeForce GT 645 OEM

Architecture

Maxwell (2014−2018)

Fermi 2.0 (2010−2014)

GPU code name

N16S-GT-S/B

GF114

Market segment

Laptop

Desktop

Release date

March 2015

April 2012

Bus support

PCI Express 3.0

Interface

PCIe 3.0 x8

PCIe 2.0 x16

Boost clock speed

1176 MHz

Core clock speed

1072 MHz

776 MHz

Floating-point performance

903.2 gflops

894.0 gflops

Manufacturing process technology

28 nm

40 nm

Number of transistors

1,870 million

1,950 million

Pipelines / CUDA cores

384

288

Power consumption (TDP)

75 Watt

102 Watt

Texture fill rate

28.22

37.25

Memory type

DDR3

GDDR5

Maximum RAM amount

4 GB

1 GB

Memory bus width

64 Bit

192 Bit

Memory clock speed

2000 MHz

3828 MHz

Memory bandwidth

14.4 GB/s

91.87 GB/s

Shared memory

Display Connectors

No outputs

2x DVI, 1x mini-HDMI

HDMI

DirectX

12 (11_0)

CUDA

2.1

OpenCL

1.2

1.1

OpenGL

4.5

4.6

Shader Model

5.1

Vulkan

1.1.126

N/A

GameWorks

GPU Boost

2.0

Optimus