GeForce 840M and WinTurbo - video card comparison

GeForce 840M

WinTurbo

Architecture

Maxwell (2014−2018)

Mach (1992−1997)

GPU code name

N15S-GT

Mach64

Market segment

Laptop

Desktop

Release date

March 2014

1995

Bus support

PCI Express 2.0, PCI Express 3.0

-

Interface

PCIe 3.0 x8

PCI

Boost clock speed

1124 MHz

-

Core clock speed

1029 MHz

40 MHz

Floating-point performance

863.2 gflops

-

Manufacturing process technology

28 nm

600 nm

Number of transistors

-

1 million

Pipelines / CUDA cores

384

-

Power consumption (TDP)

33 Watt

-

Texture fill rate

17.98

-

Memory type

DDR3

VRAM

Maximum RAM amount

4 GB

2 MB

Memory bus width

64 Bit

64 Bit

Memory clock speed

2000 MHz

40 MHz

Memory bandwidth

16.02 GB/s

320.0 MB/s

Shared memory

-

-

Display Connectors

No outputs

1x VGA

DirectX

12 (11_0)

N/A

CUDA

+

-

OpenCL

1.2

N/A

OpenGL

4.5

N/A

Shader Model

5.1

-

Vulkan

1.1.126

N/A

GameWorks

+

-

GPU Boost

2.0

-

Optimus

+

-