NVIDIA GeForce GT 820M vs NVIDIA GeForce 840M

VS

NVIDIA GeForce GT 820M NVIDIA GeForce 840M

We compared two Mobile platform GPUs: 1024MB VRAM GeForce GT 820M and 2GB VRAM GeForce 840M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 820M 's Advantages

Lower TDP (15W vs 33W)

NVIDIA GeForce 840M 's Advantages

Boost Clock1124MHz

More VRAM (2GB vs 1GB)

Larger VRAM bandwidth (16.02GB/s vs 14.40GB/s)

288 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 820M

0.298 TFLOPS

GeForce 840M +189%

0.863 TFLOPS

GeForce GT 820M

VS

GeForce 840M

Graphics Card

Nov 2013

Release Date

Mar 2014

GeForce 800M

Generation

GeForce 800M

Mobile

Type

Mobile

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x8

Clock Speeds

-

Base Clock

1029 MHz

-

Boost Clock

1124 MHz

900 MHz

Memory Clock

1001 MHz

Memory

1024MB

Memory Size

2GB

DDR3

Memory Type

DDR3

64bit

Memory Bus

64bit

14.40GB/s

Bandwidth

16.02GB/s

Render Config

2

SM Count

-

Compute Units

-

96

Shading Units

384

16

TMUs

16

8

ROPs

8

-

Tensor Cores

-

RT Cores

-

64 KB (per SM)

L1 Cache

64 KB (per SMM)

128 KB

L2 Cache

1024 KB

Theoretical Performance

3.100 GPixel/s

Pixel Rate

8.992 GPixel/s

12.40 GTexel/s

Texture Rate

17.98 GTexel/s

-

FP16 (half)

-

297.6 GFLOPS

FP32 (float)

863.2 GFLOPS

24.80 GFLOPS

FP64 (double)

26.98 GFLOPS

Graphics Processor

GF117

GPU Name

GM108

N15V-GM

GPU Variant

N15S-GT

Fermi 2.0

Architecture

Maxwell

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

0.585 billion

Transistors

Unknown

116 mm²

Die Size

Unknown

Board Design

15W

TDP

33W

-

Suggested PSU

-

No outputs

Outputs

No outputs

-

Power Connectors

-

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

1.1

OpenCL

3.0

N/A

Vulkan

1.3

2.1

CUDA

5.0

5.1

Shader Model

5.1

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