NVIDIA GeForce GT 645 OEM vs NVIDIA GeForce GTX 660 OEM

VS

NVIDIA GeForce GT 645 OEM

NVIDIA GeForce GTX 660 OEM

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 1536MB VRAM GeForce GTX 660 OEM 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 130W)

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

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM

0.894 TFLOPS

GeForce GTX 660 OEM +128%

2.046 TFLOPS

GeForce GT 645 OEM

VS

GeForce GTX 660 OEM

Graphics Card

Apr 2012

Release Date

Aug 2012

GeForce 600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

823 MHz

-

Boost Clock

888 MHz

957 MHz

Memory Clock

1400 MHz

Memory

1024MB

Memory Size

1536MB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

192bit

91.87GB/s

Bandwidth

134.4GB/s

Render Config

-

6

SM Count

-

288

Shading Units

1152

48

TMUs

96

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

21.31 GPixel/s

37.25 GTexel/s

Texture Rate

85.25 GTexel/s

-

894.0 GFLOPS

FP32 (float)

2.046 TFLOPS

74.50 GFLOPS

FP64 (double)

85.25 GFLOPS

Board Design

102W

TDP

130W

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

GK104

-

GPU Variant

GK104-200-KD-A2

Fermi 2.0

Architecture

Kepler

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.95 billion

Transistors

3.54 billion

332 mm²

Die Size

294 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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