GeForce GT 650M SLI and GeForce 840M - video card comparison

GeForce GT 650M SLI

GeForce 840M

Architecture

Kepler (2012−2018)

Maxwell (2014−2018)

GPU code name

N13E-GE

N15S-GT

Market segment

Laptop

Laptop

Release date

March 2012

March 2014

Bus support

-

PCI Express 2.0, PCI Express 3.0

Interface

-

PCIe 3.0 x8

Boost clock speed

835 MHz

1124 MHz

Core clock speed

790 MHz

1029 MHz

Floating-point performance

-

863.2 gflops

Manufacturing process technology

28 nm

28 nm

Pipelines / CUDA cores

768

384

Power consumption (TDP)

-

33 Watt

Texture fill rate

-

17.98

Memory type

GDDR5

DDR3

Maximum RAM amount

2x2 GB

4 GB

Memory bus width

2x 128 Bit

64 Bit

Memory clock speed

4000 MHz

2000 MHz

Memory bandwidth

-

16.02 GB/s

Shared memory

-

-

Display Connectors

-

No outputs

DirectX

11

12 (11_0)

CUDA

+

+

OpenCL

-

1.2

OpenGL

-

4.5

Shader Model

-

5.1

Vulkan

-

1.1.126

GameWorks

-

+

GPU Boost

-

2.0

Optimus

+

+