NVIDIA GeForce 840M vs AMD Radeon R9 M390X

VS

NVIDIA GeForce 840M

AMD Radeon R9 M390X

We compared two Mobile platform GPUs: 2GB VRAM GeForce 840M and 4GB VRAM Radeon R9 M390X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce 840M 's Advantages

Boost Clock1124MHz

Lower TDP (33W vs 75W)

AMD Radeon R9 M390X 's Advantages

Released 1 years and 2 months late

More VRAM (4GB vs 2GB)

Larger VRAM bandwidth (160.0GB/s vs 16.02GB/s)

1664 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce 840M

0.863 TFLOPS

Radeon R9 M390X +243%

2.961 TFLOPS

GeForce 840M

VS

Radeon R9 M390X

Graphics Card

Mar 2014

Release Date

May 2015

GeForce 800M

Generation

Crystal System

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

PCIe 3.0 x16

Clock Speeds

1029 MHz

Base Clock

-

1124 MHz

Boost Clock

-

1001 MHz

Memory Clock

1250 MHz

Memory

2GB

Memory Size

4GB

DDR3

Memory Type

GDDR5

64bit

Memory Bus

256bit

16.02GB/s

Bandwidth

160.0GB/s

Render Config

-

Compute Units

32

-

384

Shading Units

2048

16

TMUs

128

8

ROPs

32

-

64 KB (per SMM)

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

512 KB

-

Theoretical Performance

8.992 GPixel/s

Pixel Rate

23.14 GPixel/s

17.98 GTexel/s

Texture Rate

92.54 GTexel/s

-

FP16 (half)

2.961 TFLOPS

863.2 GFLOPS

FP32 (float)

2.961 TFLOPS

26.98 GFLOPS

FP64 (double)

185.1 GFLOPS

Board Design

33W

TDP

75W

-

No outputs

Outputs

No outputs

-

Power Connectors

None

Graphics Processor

GM108

GPU Name

Amethyst

N15S-GT

GPU Variant

Amethyst XT

Maxwell

Architecture

GCN 3.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

Unknown

Transistors

5 billion

Unknown

Die Size

366 mm²

Graphics Features

12 (11_0)

DirectX

12 (12_0)

4.6

OpenGL

4.6

3.0

OpenCL

2.0

1.3

Vulkan

1.2

5.0

CUDA

-

5.1

Shader Model

6.3

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