NVIDIA GeForce 840M vs NVIDIA GeForce GT 640M LE

VS

NVIDIA GeForce 840M

NVIDIA GeForce GT 640M LE

We compared two Mobile platform GPUs: 2GB VRAM GeForce 840M and 2GB VRAM GeForce GT 640M LE 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 10 months late

Boost Clock1124MHz

288 additional rendering cores

NVIDIA GeForce GT 640M LE 's Advantages

Larger VRAM bandwidth (50.24GB/s vs 16.02GB/s)

Lower TDP (32W vs 33W)

Score

Benchmark

FP32 (float)

GeForce 840M +198%

0.863 TFLOPS

GeForce GT 640M LE

0.289 TFLOPS

GeForce 840M

VS

GeForce GT 640M LE

Graphics Card

Mar 2014

Release Date

May 2012

GeForce 800M

Generation

GeForce 600M

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

PCIe 2.0 x16

Clock Speeds

1029 MHz

Base Clock

-

1124 MHz

Boost Clock

-

1001 MHz

Memory Clock

785 MHz

Memory

2GB

Memory Size

2GB

DDR3

Memory Type

GDDR5

64bit

Memory Bus

128bit

16.02GB/s

Bandwidth

50.24GB/s

Render Config

-

SM Count

2

384

Shading Units

96

16

TMUs

16

8

ROPs

4

-

64 KB (per SMM)

L1 Cache

64 KB (per SM)

1024 KB

L2 Cache

256 KB

-

Theoretical Performance

8.992 GPixel/s

Pixel Rate

3.012 GPixel/s

17.98 GTexel/s

Texture Rate

12.05 GTexel/s

-

863.2 GFLOPS

FP32 (float)

289.0 GFLOPS

26.98 GFLOPS

FP64 (double)

24.08 GFLOPS

Board Design

33W

TDP

32W

-

No outputs

Outputs

No outputs

-

Graphics Processor

GM108

GPU Name

GF108

N15S-GT

GPU Variant

-

Maxwell

Architecture

Fermi

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

Unknown

Transistors

0.585 billion

Unknown

Die Size

116 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

3.0

OpenCL

1.1

1.3

Vulkan

N/A

5.0

CUDA

2.1

5.1

Shader Model

5.1

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