NVIDIA GeForce 8400 vs NVIDIA GeForce GT 640

VS

NVIDIA GeForce 8400

NVIDIA GeForce GT 640

We compared two Desktop platform GPUs: 256MB VRAM GeForce 8400 and 2GB VRAM GeForce GT 640 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce 8400 's Advantages

Lower TDP (25W vs 65W)

NVIDIA GeForce GT 640 's Advantages

Released 4 years and 6 months late

More VRAM (2GB vs 256GB)

Larger VRAM bandwidth (28.51GB/s vs 8.000GB/s)

376 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce 8400

0.021 TFLOPS

GeForce GT 640 +3200%

0.693 TFLOPS

GeForce 8400

VS

GeForce GT 640

Graphics Card

Dec 2007

Release Date

Jun 2012

GeForce 8

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

500 MHz

Memory Clock

891 MHz

Memory

256MB

Memory Size

2GB

DDR2

Memory Type

DDR3

64bit

Memory Bus

128bit

8.000GB/s

Bandwidth

28.51GB/s

Render Config

-

1

SM Count

-

8

Shading Units

384

4

TMUs

32

4

ROPs

16

-

L1 Cache

16 KB (per SMX)

16 KB

L2 Cache

256 KB

-

Theoretical Performance

2.160 GPixel/s

Pixel Rate

7.216 GPixel/s

2.160 GTexel/s

Texture Rate

28.86 GTexel/s

-

20.80 GFLOPS

FP32 (float)

692.7 GFLOPS

-

FP64 (double)

28.86 GFLOPS

Board Design

25W

TDP

65W

200 W

Suggested PSU

250 W

1x DVI 1x VGA 1x S-Video

Outputs

1x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

None

Power Connectors

None

Graphics Processor

G98

GPU Name

GK107

-

GPU Variant

GK107-300-A2

Tesla

Architecture

Kepler

TSMC

Foundry

TSMC

65 nm

Process Size

28 nm

0.21 billion

Transistors

1.27 billion

86 mm²

Die Size

118 mm²

Graphics Features

11.1 (10_0)

DirectX

12 (11_0)

3.3

OpenGL

4.6

1.1

OpenCL

3.0

N/A

Vulkan

1.1

CUDA

3.0

4.0

Shader Model

5.1

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