Radeon HD 6850 and GeForce GTX 645 OEM - video card comparison

Radeon HD 6850

GeForce GTX 645 OEM

Architecture

TeraScale 2 (2009−2015)

Kepler (2012−2018)

GPU code name

Barts

GK106

Market segment

Desktop

Desktop

Release date

October 2010

April 2013

Bus support

AGP

-

Interface

PCIe 2.0 x16

PCIe 3.0 x16

Supplementary power connectors

1x 6-pin

None

Core clock speed

-

824 MHz

Floating-point performance

1,488.0 gflops

949.2 gflops

Manufacturing process technology

40 nm

28 nm

Number of transistors

1,700 million

2,540 million

Pipelines / CUDA cores

960

576

Power consumption (TDP)

127 Watt

65 Watt

Texture fill rate

37.20

39.55

Memory type

GDDR5

GDDR5

Maximum RAM amount

1 GB

1 GB

Memory bus width

256 Bit

128 Bit

Memory clock speed

-

4000 MHz

Memory bandwidth

128.0 GB/s

64 GB/s

Display Connectors

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

1x 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

-

-