Radeon R9 M390 and GeForce 840M - video card comparison

Radeon R9 M390

GeForce 840M

Architecture

GCN (2011−2017)

Maxwell (2014−2018)

GPU code name

Pitcairn

N15S-GT

Market segment

Laptop

Laptop

Release date

June 2015

March 2014

Bus support

PCIe 3.0

PCI Express 2.0, PCI Express 3.0

Interface

-

PCIe 3.0 x8

Boost clock speed

-

1124 MHz

Core clock speed

-

1029 MHz

Floating-point performance

-

863.2 gflops

Manufacturing process technology

28 nm

28 nm

Number of transistors

5000 Million

-

Pipelines / CUDA cores

1024

384

Power consumption (TDP)

-

33 Watt

Texture fill rate

-

17.98

Memory type

GDDR5

DDR3

Maximum RAM amount

2 GB

4 GB

Memory bus width

256 Bit

64 Bit

Memory clock speed

-

2000 MHz

Memory bandwidth

-

16.02 GB/s

Shared memory

-

-

Display Connectors

-

No outputs

Eyefinity

1

-

DirectX

DirectX® 12

12 (11_0)

CUDA

-

+

Mantle

+

-

OpenCL

Not Listed

1.2

OpenGL

4.4

4.5

Shader Model

-

5.1

Vulkan

-

1.1.126

AppAcceleration

-

-

DualGraphics

1

-

Enduro

-

-

FreeSync

1

-

GameWorks

-

+

GPU Boost

-

2.0

HD3D

+

-

Optimus

-

+

PowerTune

+

-

Switchable graphics

1

-

TrueAudio

-

-

ZeroCore

+

-