NVIDIA GeForce 8400 vs NVIDIA GeForce GT 640 OEM

VS

NVIDIA GeForce 8400 NVIDIA GeForce GT 640 OEM

We compared two Desktop platform GPUs: 256MB VRAM GeForce 8400 and 2GB VRAM GeForce GT 640 OEM 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 50W)

NVIDIA GeForce GT 640 OEM 's Advantages

Released 4 years and 4 months late

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 OEM +2814%

0.612 TFLOPS

GeForce 8400

VS

GeForce GT 640 OEM

Graphics Card

Dec 2007

Release Date

Apr 2012

GeForce 8

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

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

-

Compute Units

-

8

Shading Units

384

4

TMUs

32

4

ROPs

16

-

Tensor Cores

-

RT Cores

-

L1 Cache

16 KB (per SMX)

16 KB

L2 Cache

256 KB

Theoretical Performance

2.160 GPixel/s

Pixel Rate

6.376 GPixel/s

2.160 GTexel/s

Texture Rate

25.50 GTexel/s

-

FP16 (half)

-

20.80 GFLOPS

FP32 (float)

612.1 GFLOPS

-

FP64 (double)

25.50 GFLOPS

Graphics Processor

G98

GPU Name

GK107

-

GPU Variant

GK107-320-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

Board Design

25W

TDP

50W

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 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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