NVIDIA GeForce GTX 660 OEM vs NVIDIA GeForce GT 645 OEM

VS

NVIDIA GeForce GTX 660 OEM

NVIDIA GeForce GT 645 OEM

We compared two Desktop platform GPUs: 1536MB VRAM GeForce GTX 660 OEM 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 GTX 660 OEM 's Advantages

Boost Clock888MHz

More VRAM (1536GB vs 1024GB)

Larger VRAM bandwidth (134.4GB/s vs 91.87GB/s)

864 additional rendering cores

NVIDIA GeForce GT 645 OEM 's Advantages

Lower TDP (102W vs 130W)

Score

Benchmark

FP32 (float)

GeForce GTX 660 OEM +128%

2.046 TFLOPS

GeForce GT 645 OEM

0.894 TFLOPS

GeForce GTX 660 OEM

VS

GeForce GT 645 OEM

Graphics Card

Aug 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

823 MHz

Base Clock

-

888 MHz

Boost Clock

-

1400 MHz

Memory Clock

957 MHz

Memory

1536MB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

192bit

134.4GB/s

Bandwidth

91.87GB/s

Render Config

-

SM Count

6

1152

Shading Units

288

96

TMUs

48

24

ROPs

24

-

16 KB (per SMX)

L1 Cache

64 KB (per SM)

384 KB

L2 Cache

384 KB

-

Theoretical Performance

21.31 GPixel/s

Pixel Rate

9.312 GPixel/s

85.25 GTexel/s

Texture Rate

37.25 GTexel/s

-

2.046 TFLOPS

FP32 (float)

894.0 GFLOPS

85.25 GFLOPS

FP64 (double)

74.50 GFLOPS

Board Design

130W

TDP

102W

300 W

Suggested PSU

300 W

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

Outputs

2x DVI 1x mini-HDMI 1.3a

1x 6-pin

Power Connectors

-

Graphics Processor

GK104

GPU Name

GF114

GK104-200-KD-A2

GPU Variant

-

Kepler

Architecture

Fermi 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

3.54 billion

Transistors

1.95 billion

294 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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