NVIDIA GeForce GT 640 vs NVIDIA GeForce GT 645 OEM

VS

NVIDIA GeForce GT 640

NVIDIA GeForce GT 645 OEM

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 1024MB VRAM GeForce GT 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

More VRAM (2GB vs 1024GB)

96 additional rendering cores

Lower TDP (65W vs 102W)

NVIDIA GeForce GT 645 OEM 's Advantages

Larger VRAM bandwidth (91.87GB/s vs 28.51GB/s)

Score

Benchmark

FP32 (float)

GeForce GT 640

0.693 TFLOPS

GeForce GT 645 OEM +29%

0.894 TFLOPS

GeForce GT 640

VS

GeForce GT 645 OEM

Graphics Card

Jun 2012

Release Date

Apr 2012

GeForce 600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

891 MHz

Memory Clock

957 MHz

Memory

2GB

Memory Size

1024MB

DDR3

Memory Type

GDDR5

128bit

Memory Bus

192bit

28.51GB/s

Bandwidth

91.87GB/s

Render Config

-

SM Count

6

384

Shading Units

288

32

TMUs

48

16

ROPs

24

-

16 KB (per SMX)

L1 Cache

64 KB (per SM)

256 KB

L2 Cache

384 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

9.312 GPixel/s

28.86 GTexel/s

Texture Rate

37.25 GTexel/s

-

692.7 GFLOPS

FP32 (float)

894.0 GFLOPS

28.86 GFLOPS

FP64 (double)

74.50 GFLOPS

Board Design

65W

TDP

102W

250 W

Suggested PSU

300 W

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

Outputs

2x DVI 1x mini-HDMI 1.3a

None

Power Connectors

-

Graphics Processor

GK107

GPU Name

GF114

GK107-300-A2

GPU Variant

-

Kepler

Architecture

Fermi 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

1.27 billion

Transistors

1.95 billion

118 mm²

Die Size

332 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

3.0

OpenCL

1.1

Vulkan

N/A

3.0

CUDA

2.1

5.1

Shader Model

5.1

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