NVIDIA GeForce GT 820M vs NVIDIA GeForce GT 640M

VS

NVIDIA GeForce GT 820M NVIDIA GeForce GT 640M

We compared two Mobile platform GPUs: 1024MB VRAM GeForce GT 820M and 2GB VRAM GeForce GT 640M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 820M 's Advantages

Released 1 years and 8 months late

Lower TDP (15W vs 32W)

NVIDIA GeForce GT 640M 's Advantages

More VRAM (2GB vs 1GB)

Larger VRAM bandwidth (28.80GB/s vs 14.40GB/s)

288 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 820M

0.298 TFLOPS

GeForce GT 640M +61%

0.48 TFLOPS

GeForce GT 820M

VS

GeForce GT 640M

Graphics Card

Nov 2013

Release Date

Mar 2012

GeForce 800M

Generation

GeForce 600M

Mobile

Type

Mobile

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

900 MHz

Memory Clock

900 MHz

Memory

1024MB

Memory Size

2GB

DDR3

Memory Type

DDR3

64bit

Memory Bus

128bit

14.40GB/s

Bandwidth

28.80GB/s

Render Config

2

SM Count

-

Compute Units

-

96

Shading Units

384

16

TMUs

32

8

ROPs

16

-

Tensor Cores

-

RT Cores

-

64 KB (per SM)

L1 Cache

16 KB (per SMX)

128 KB

L2 Cache

256 KB

Theoretical Performance

3.100 GPixel/s

Pixel Rate

5.000 GPixel/s

12.40 GTexel/s

Texture Rate

20.00 GTexel/s

-

FP16 (half)

-

297.6 GFLOPS

FP32 (float)

480.0 GFLOPS

24.80 GFLOPS

FP64 (double)

20.00 GFLOPS

Graphics Processor

GF117

GPU Name

GK107

N15V-GM

GPU Variant

N13P-GS

Fermi 2.0

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

0.585 billion

Transistors

1.27 billion

116 mm²

Die Size

118 mm²

Board Design

15W

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

1.1

OpenCL

3.0

N/A

Vulkan

1.1

2.1

CUDA

3.0

5.1

Shader Model

5.1

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