GeForce GTX 660 OEM and Radeon HD 6850 - video card comparison

GeForce GTX 660 OEM

Radeon HD 6850

Architecture

Kepler (2012−2018)

TeraScale 2 (2009−2015)

GPU code name

GK104

Barts

Market segment

Desktop

Desktop

Release date

August 2012

October 2010

Bus support

-

AGP

Interface

PCIe 3.0 x16

PCIe 2.0 x16

Supplementary power connectors

1x 6-pin

1x 6-pin

Boost clock speed

888 MHz

-

Core clock speed

823 MHz

-

Floating-point performance

2,046 gflops

1,488.0 gflops

Manufacturing process technology

28 nm

40 nm

Number of transistors

3,540 million

1,700 million

Pipelines / CUDA cores

1152

960

Power consumption (TDP)

130 Watt

127 Watt

Texture fill rate

85.25

37.20

Memory type

GDDR5

GDDR5

Maximum RAM amount

2 GB

1 GB

Memory bus width

256 Bit

256 Bit

Memory clock speed

5600 MHz

-

Memory bandwidth

179.2 GB/s

128.0 GB/s

Display Connectors

2x DVI, 1x HDMI, 1x DisplayPort

2x DVI, 1x HDMI, 2x mini-DisplayPort

Eyefinity

-

1

HDMI

+

+

DisplayPort support

-

-

DirectX

12 (11_0)

DirectX® 11

CUDA

3.0

-

Mantle

-

-

OpenCL

1.2

1.2

OpenGL

4.6

4.4

Shader Model

5.1

5.0

Vulkan

1.1.126

-

AppAcceleration

-

-

CrossFire

-

1

Enduro

-

-

HD3D

-

-

PowerTune

-

-

TrueAudio

-

-

ZeroCore

-

-