NVIDIA GeForce 840A vs NVIDIA GeForce 820A

VS

NVIDIA GeForce 840A

NVIDIA GeForce 820A

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

Main Differences

NVIDIA GeForce 840A 's Advantages

Boost Clock1124MHz

More VRAM (2GB vs 1024GB)

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

288 additional rendering cores

NVIDIA GeForce 820A 's Advantages

Lower TDP (15W vs 33W)

Score

Benchmark

FP32 (float)

GeForce 840A +189%

0.863 TFLOPS

GeForce 820A

0.298 TFLOPS

GeForce 840A

VS

GeForce 820A

Graphics Card

Mar 2014

Release Date

Mar 2014

GeForce 800A

Generation

GeForce 800A

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

900 MHz

Memory

2GB

Memory Size

1024MB

DDR3

Memory Type

DDR3

64bit

Memory Bus

64bit

16.02GB/s

Bandwidth

14.40GB/s

Render Config

-

SM Count

2

384

Shading Units

96

16

TMUs

16

8

ROPs

8

-

64 KB (per SMM)

L1 Cache

64 KB (per SM)

1024 KB

L2 Cache

128 KB

-

Theoretical Performance

8.992 GPixel/s

Pixel Rate

3.100 GPixel/s

17.98 GTexel/s

Texture Rate

12.40 GTexel/s

-

863.2 GFLOPS

FP32 (float)

297.6 GFLOPS

26.98 GFLOPS

FP64 (double)

24.80 GFLOPS

Board Design

33W

TDP

15W

-

No outputs

Outputs

No outputs

-

Graphics Processor

GM108

GPU Name

GF117

-

GPU Variant

N15V-GM

Maxwell

Architecture

Fermi 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 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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