NVIDIA GeForce GT 640 vs NVIDIA GeForce 8400

VS

NVIDIA GeForce GT 640

NVIDIA GeForce 8400

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

Main Differences

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

NVIDIA GeForce 8400 's Advantages

Lower TDP (25W vs 65W)

Score

Benchmark

FP32 (float)

GeForce GT 640 +3200%

0.693 TFLOPS

GeForce 8400

0.021 TFLOPS

GeForce GT 640

VS

GeForce 8400

Graphics Card

Jun 2012

Release Date

Dec 2007

GeForce 600

Generation

GeForce 8

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

891 MHz

Memory Clock

500 MHz

Memory

2GB

Memory Size

256MB

DDR3

Memory Type

DDR2

128bit

Memory Bus

64bit

28.51GB/s

Bandwidth

8.000GB/s

Render Config

-

SM Count

1

384

Shading Units

8

32

TMUs

4

16

ROPs

4

-

16 KB (per SMX)

L1 Cache

-

256 KB

L2 Cache

16 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

2.160 GPixel/s

28.86 GTexel/s

Texture Rate

2.160 GTexel/s

-

692.7 GFLOPS

FP32 (float)

20.80 GFLOPS

28.86 GFLOPS

FP64 (double)

-

Board Design

65W

TDP

25W

250 W

Suggested PSU

200 W

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

Outputs

1x DVI 1x VGA 1x S-Video

None

Power Connectors

None

Graphics Processor

GK107

GPU Name

G98

GK107-300-A2

GPU Variant

-

Kepler

Architecture

Tesla

TSMC

Foundry

TSMC

28 nm

Process Size

65 nm

1.27 billion

Transistors

0.21 billion

118 mm²

Die Size

86 mm²

Graphics Features

12 (11_0)

DirectX

11.1 (10_0)

4.6

OpenGL

3.3

3.0

OpenCL

1.1

Vulkan

N/A

3.0

CUDA

1.1

5.1

Shader Model

4.0

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