Radeon HD 6870 and GeForce GTX 660 Rev. 2 - video card comparison

Radeon HD 6870

GeForce GTX 660 Rev. 2

Architecture

Terascale 2 (2009−2015)

Kepler (2012−2018)

GPU code name

RV940 Barts

GK104

Market segment

Desktop

Desktop

Release date

October 2010

September 2014

Bus support

PCIe 2.0 x16

-

Interface

PCIe 2.0 x16

PCIe 3.0 x16

Supplementary power connectors

2x 6-pin

1x 6-pin

Boost clock speed

900 MHz

1032 MHz

Core clock speed

-

980 MHz

Floating-point performance

2,016.0 gflops

1,981 gflops

Manufacturing process technology

40 nm

28 nm

Number of transistors

1,700 million

3,540 million

Pipelines / CUDA cores

1120

960

Power consumption (TDP)

151 Watt

140 Watt

Texture fill rate

50.40

82.56

Memory type

GDDR5

GDDR5

Maximum RAM amount

1 GB

2 GB

Memory bus width

256 Bit

192 Bit

Memory clock speed

1050 MHz

6008 MHz

Memory bandwidth

134.4 GB/s

144.2 GB/s

Shared memory

-

-

Display Connectors

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

2x DVI, 1x HDMI, 1x DisplayPort

Eyefinity

1

-

HDMI

+

+

DisplayPort support

-

-

DirectX

DirectX® 11

12 (11_0)

CUDA

-

3.0

Mantle

-

-

OpenCL

1.2

1.2

OpenGL

4.4

4.6

Shader Model

5.0

5.1

Vulkan

-

1.1.126

AppAcceleration

-

-

CrossFire

1

-

Enduro

-

-

HD3D

-

-

PowerTune

-

-

TrueAudio

-

-

ZeroCore

-

-