NVIDIA GeForce GT 640 vs NVIDIA GeForce GTX 660 Rev. 2

VS

NVIDIA GeForce GT 640

NVIDIA GeForce GTX 660 Rev. 2

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 2GB VRAM GeForce GTX 660 Rev. 2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

Lower TDP (65W vs 140W)

NVIDIA GeForce GTX 660 Rev. 2 's Advantages

Released 2 years and 3 months late

Boost Clock1032MHz

Larger VRAM bandwidth (144.2GB/s vs 28.51GB/s)

576 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640

0.693 TFLOPS

GeForce GTX 660 Rev. 2 +185%

1.981 TFLOPS

GeForce GT 640

VS

GeForce GTX 660 Rev. 2

Graphics Card

Jun 2012

Release Date

Sep 2014

GeForce 600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

980 MHz

-

Boost Clock

1032 MHz

891 MHz

Memory Clock

1502 MHz

Memory

2GB

Memory Size

2GB

DDR3

Memory Type

GDDR5

128bit

Memory Bus

192bit

28.51GB/s

Bandwidth

144.2GB/s

Render Config

-

384

Shading Units

960

32

TMUs

80

16

ROPs

24

-

16 KB (per SMX)

L1 Cache

16 KB (per SMX)

256 KB

L2 Cache

384 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

20.64 GPixel/s

28.86 GTexel/s

Texture Rate

82.56 GTexel/s

-

692.7 GFLOPS

FP32 (float)

1.981 TFLOPS

28.86 GFLOPS

FP64 (double)

82.56 GFLOPS

Board Design

65W

TDP

140W

250 W

Suggested PSU

300 W

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

Outputs

2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

None

Power Connectors

1x 6-pin

Graphics Processor

GK107

GPU Name

GK104

GK107-300-A2

GPU Variant

-

Kepler

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.27 billion

Transistors

3.54 billion

118 mm²

Die Size

294 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

3.0

OpenCL

3.0

1.1

Vulkan

1.1

3.0

CUDA

3.0

5.1

Shader Model

5.1

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