Radeon HD 6770 and GeForce GT 640 Rev. 2 - video card comparison

Radeon HD 6770

GeForce GT 640 Rev. 2

Architecture

TeraScale 2 (2009−2015)

Kepler 2.0 (2013−2015)

GPU code name

Juniper

GK208

Market segment

Desktop

Desktop

Release date

January 2011

May 2013

Bus support

PCIe 2.0 x16

-

Interface

PCIe 2.0 x16

PCIe 2.0 x8

Supplementary power connectors

1x 6-pin

None

Boost clock speed

900 MHz

-

Core clock speed

-

1046 MHz

Floating-point performance

1,360.0 gflops

803.3 gflops

Manufacturing process technology

40 nm

28 nm

Number of transistors

1,040 million

915 million

Pipelines / CUDA cores

800

384

Power consumption (TDP)

108 Watt

49 Watt

Texture fill rate

34.00

33.47

Memory type

GDDR5

GDDR5

Maximum RAM amount

1 GB

1 GB

Memory bus width

128 Bit

64 Bit

Memory clock speed

1050 MHz

5008 MHz

Memory bandwidth

76.8 GB/s

40.06 GB/s

Display Connectors

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

1x DVI, 1x HDMI, 1x VGA

Eyefinity

1

-

HDMI

+

+

DisplayPort support

-

-

DirectX

DirectX® 11

12 (11_0)

CUDA

-

3.5

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

-

-