NVIDIA GeForce 840A vs NVIDIA GeForce GT 420M

VS

NVIDIA GeForce 840A

NVIDIA GeForce GT 420M

We compared two Mobile platform GPUs: 2GB VRAM GeForce 840A and 512MB VRAM GeForce GT 420M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce 840A 's Advantages

Released 3 years and 6 months late

Boost Clock1124MHz

More VRAM (2GB vs 512GB)

288 additional rendering cores

NVIDIA GeForce GT 420M 's Advantages

Larger VRAM bandwidth (25.60GB/s vs 16.02GB/s)

Lower TDP (23W vs 33W)

Score

Benchmark

FP32 (float)

GeForce 840A +349%

0.863 TFLOPS

GeForce GT 420M

0.192 TFLOPS

GeForce 840A

VS

GeForce GT 420M

Graphics Card

Mar 2014

Release Date

Sep 2010

GeForce 800A

Generation

GeForce 400M

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

800 MHz

Memory

2GB

Memory Size

512MB

DDR3

Memory Type

DDR3

64bit

Memory Bus

128bit

16.02GB/s

Bandwidth

25.60GB/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

2.000 GPixel/s

17.98 GTexel/s

Texture Rate

8.000 GTexel/s

-

863.2 GFLOPS

FP32 (float)

192.0 GFLOPS

26.98 GFLOPS

FP64 (double)

16.00 GFLOPS

Board Design

33W

TDP

23W

-

No outputs

Outputs

No outputs

-

Graphics Processor

GM108

GPU Name

GF108

-

GPU Variant

N11P-GE-A1

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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