NVIDIA GeForce GT 645 OEM vs NVIDIA GeForce GTX 660

VS

NVIDIA GeForce GT 645 OEM

NVIDIA GeForce GTX 660

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 2GB VRAM GeForce GTX 660 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 645 OEM 's Advantages

Lower TDP (102W vs 140W)

NVIDIA GeForce GTX 660 's Advantages

Boost Clock1032MHz

More VRAM (2GB vs 1024GB)

Larger VRAM bandwidth (144.2GB/s vs 91.87GB/s)

672 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM

0.894 TFLOPS

GeForce GTX 660 +121%

1.981 TFLOPS

GeForce GT 645 OEM

VS

GeForce GTX 660

Graphics Card

Apr 2012

Release Date

Sep 2012

GeForce 600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

980 MHz

-

Boost Clock

1032 MHz

957 MHz

Memory Clock

1502 MHz

Memory

1024MB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

192bit

91.87GB/s

Bandwidth

144.2GB/s

Render Config

-

6

SM Count

-

288

Shading Units

960

48

TMUs

80

24

ROPs

24

-

64 KB (per SM)

L1 Cache

16 KB (per SMX)

384 KB

L2 Cache

384 KB

-

Theoretical Performance

9.312 GPixel/s

Pixel Rate

20.64 GPixel/s

37.25 GTexel/s

Texture Rate

82.56 GTexel/s

-

894.0 GFLOPS

FP32 (float)

1.981 TFLOPS

74.50 GFLOPS

FP64 (double)

82.56 GFLOPS

Board Design

102W

TDP

140W

300 W

Suggested PSU

300 W

2x DVI 1x mini-HDMI 1.3a

Outputs

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

-

Power Connectors

1x 6-pin

Graphics Processor

GF114

GPU Name

GK106

-

GPU Variant

GK106-400-A1

Fermi 2.0

Architecture

Kepler

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.95 billion

Transistors

2.54 billion

332 mm²

Die Size

221 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

1.1

OpenCL

3.0

N/A

Vulkan

1.1

2.1

CUDA

3.0

5.1

Shader Model

5.1

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