Radeon HD 6870 and GeForce 8800 GTS 640 - video card comparison

Radeon HD 6870

GeForce 8800 GTS 640

Architecture

Terascale 2 (2009−2015)

Tesla (2006−2010)

GPU code name

RV940 Barts

G80

Market segment

Desktop

Desktop

Release date

October 2010

November 2006

Bus support

PCIe 2.0 x16

-

Interface

PCIe 2.0 x16

PCIe 1.0 x16

Supplementary power connectors

2x 6-pin

1x 6-pin

Boost clock speed

900 MHz

-

Core clock speed

-

513 MHz

Floating-point performance

2,016.0 gflops

228.1 gflops

Manufacturing process technology

40 nm

90 nm

Number of transistors

1,700 million

681 million

Pipelines / CUDA cores

1120

96

Power consumption (TDP)

151 Watt

143 Watt

Texture fill rate

50.40

24.62

Memory type

GDDR5

GDDR3

Maximum RAM amount

1 GB

640 MB

Memory bus width

256 Bit

320 Bit

Memory clock speed

1050 MHz

1584 MHz

Memory bandwidth

134.4 GB/s

63.36 GB/s

Shared memory

-

-

Display Connectors

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

2x DVI, 1x S-Video

Eyefinity

1

-

HDMI

+

-

DisplayPort support

-

-

DirectX

DirectX® 11

11.1 (10_0)

CUDA

-

+

Mantle

-

-

OpenCL

1.2

1.1

OpenGL

4.4

3.3

Shader Model

5.0

4.0

Vulkan

-

N/A

AppAcceleration

-

-

CrossFire

1

-

Enduro

-

-

HD3D

-

-

PowerTune

-

-

TrueAudio

-

-

ZeroCore

-

-