NVIDIA GeForce GTX 660 vs NVIDIA GeForce GT 640

VS

NVIDIA GeForce GTX 660

NVIDIA GeForce GT 640

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

Main Differences

NVIDIA GeForce GTX 660 's Advantages

Boost Clock1032MHz

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

576 additional rendering cores

NVIDIA GeForce GT 640 's Advantages

Lower TDP (65W vs 140W)

Score

Benchmark

FP32 (float)

GeForce GTX 660 +185%

1.981 TFLOPS

GeForce GT 640

0.693 TFLOPS

Blender

GeForce GTX 660 +246%

111

GeForce GT 640

32

OctaneBench

GeForce GTX 660 +237%

27

GeForce GT 640

8

GeForce GTX 660

VS

GeForce GT 640

Graphics Card

Sep 2012

Release Date

Jun 2012

GeForce 600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

980 MHz

Base Clock

-

1032 MHz

Boost Clock

-

1502 MHz

Memory Clock

891 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

DDR3

192bit

Memory Bus

128bit

144.2GB/s

Bandwidth

28.51GB/s

Render Config

-

960

Shading Units

384

80

TMUs

32

24

ROPs

16

-

16 KB (per SMX)

L1 Cache

16 KB (per SMX)

384 KB

L2 Cache

256 KB

-

Theoretical Performance

20.64 GPixel/s

Pixel Rate

7.216 GPixel/s

82.56 GTexel/s

Texture Rate

28.86 GTexel/s

-

1.981 TFLOPS

FP32 (float)

692.7 GFLOPS

82.56 GFLOPS

FP64 (double)

28.86 GFLOPS

Board Design

140W

TDP

65W

300 W

Suggested PSU

250 W

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

Outputs

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

1x 6-pin

Power Connectors

None

Graphics Processor

GK106

GPU Name

GK107

GK106-400-A1

GPU Variant

GK107-300-A2

Kepler

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

2.54 billion

Transistors

1.27 billion

221 mm²

Die Size

118 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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