NVIDIA GeForce 840M vs NVIDIA GeForce GT 645M

VS

NVIDIA GeForce 840M NVIDIA GeForce GT 645M

We compared two Mobile platform GPUs: 2GB VRAM GeForce 840M and 2GB VRAM GeForce GT 645M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce 840M 's Advantages

Released 1 years and 5 months late

Boost Clock1124MHz

NVIDIA GeForce GT 645M 's Advantages

Larger VRAM bandwidth (28.80GB/s vs 16.02GB/s)

Lower TDP (32W vs 33W)

Score

Benchmark

FP32 (float)

GeForce 840M +58%

0.863 TFLOPS

GeForce GT 645M

0.544 TFLOPS

GeForce 840M

VS

GeForce GT 645M

Graphics Card

Mar 2014

Release Date

Oct 2012

GeForce 800M

Generation

GeForce 600M

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

900 MHz

Memory

2GB

Memory Size

2GB

DDR3

Memory Type

DDR3

64bit

Memory Bus

128bit

16.02GB/s

Bandwidth

28.80GB/s

Render Config

-

SM Count

-

Compute Units

-

384

Shading Units

384

16

TMUs

32

8

ROPs

16

-

Tensor Cores

-

RT Cores

-

64 KB (per SMM)

L1 Cache

16 KB (per SMX)

1024 KB

L2 Cache

256 KB

Theoretical Performance

8.992 GPixel/s

Pixel Rate

5.672 GPixel/s

17.98 GTexel/s

Texture Rate

22.69 GTexel/s

-

FP16 (half)

-

863.2 GFLOPS

FP32 (float)

544.5 GFLOPS

26.98 GFLOPS

FP64 (double)

22.69 GFLOPS

Graphics Processor

GM108

GPU Name

GK107

N15S-GT

GPU Variant

N13P-GS

Maxwell

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

Unknown

Transistors

1.27 billion

Unknown

Die Size

118 mm²

Board Design

33W

TDP

32W

-

Suggested PSU

-

No outputs

Outputs

No outputs

-

Power Connectors

-

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

3.0

OpenCL

3.0

1.3

Vulkan

1.1

5.0

CUDA

3.0

5.1

Shader Model

5.1

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