NVIDIA GeForce GT 645 OEM vs NVIDIA GeForce 8400 GS Rev. 2

VS

NVIDIA GeForce GT 645 OEM

NVIDIA GeForce 8400 GS Rev. 2

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 512MB VRAM GeForce 8400 GS Rev. 2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 645 OEM 's Advantages

Released 4 years and 4 months late

More VRAM (1024GB vs 512GB)

Larger VRAM bandwidth (91.87GB/s vs 6.400GB/s)

280 additional rendering cores

NVIDIA GeForce 8400 GS Rev. 2 's Advantages

Lower TDP (25W vs 102W)

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM +3963%

0.894 TFLOPS

GeForce 8400 GS Rev. 2

0.022 TFLOPS

GeForce GT 645 OEM

VS

GeForce 8400 GS Rev. 2

Graphics Card

Apr 2012

Release Date

Dec 2007

GeForce 600

Generation

GeForce 8

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

957 MHz

Memory Clock

400 MHz

Memory

1024MB

Memory Size

512MB

GDDR5

Memory Type

DDR2

192bit

Memory Bus

64bit

91.87GB/s

Bandwidth

6.400GB/s

Render Config

-

6

SM Count

1

288

Shading Units

8

48

TMUs

4

24

ROPs

4

-

64 KB (per SM)

L1 Cache

-

384 KB

L2 Cache

16 KB

-

Theoretical Performance

9.312 GPixel/s

Pixel Rate

2.268 GPixel/s

37.25 GTexel/s

Texture Rate

2.268 GTexel/s

-

894.0 GFLOPS

FP32 (float)

22.40 GFLOPS

74.50 GFLOPS

FP64 (double)

-

Board Design

102W

TDP

25W

300 W

Suggested PSU

200 W

2x DVI 1x mini-HDMI 1.3a

Outputs

1x DVI 1x VGA 1x S-Video

-

Power Connectors

None

Graphics Processor

GF114

GPU Name

G98

-

Fermi 2.0

Architecture

Tesla

TSMC

Foundry

TSMC

40 nm

Process Size

65 nm

1.95 billion

Transistors

0.21 billion

332 mm²

Die Size

86 mm²

Graphics Features

12 (11_0)

DirectX

11.1 (10_0)

4.6

OpenGL

3.3

1.1

OpenCL

1.1

N/A

Vulkan

N/A

2.1

CUDA

1.1

5.1

Shader Model

4.0

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