Radeon HD 6870 X2 and GeForce GT 635 OEM - video card comparison

Radeon HD 6870 X2

GeForce GT 635 OEM

Architecture

TeraScale 2 (2009−2015)

Kepler 2.0 (2013−2015)

GPU code name

Barts

GK208

Market segment

Desktop

Release date

July 2011

October 2013

Interface

PCIe 2.0 x16

PCIe 3.0 x8

Supplementary power connectors

None

Core clock speed

900 MHz

967 MHz

Floating-point performance

2x 2,016.0 gflops

742.7 gflops

Manufacturing process technology

40 nm

28 nm

Number of transistors

1,700 million

915 million

Pipelines / CUDA cores

1120

384

Power consumption (TDP)

300 Watt

35 Watt

Texture fill rate

50.40

30.94

Memory type

GDDR5

DDR3

Maximum RAM amount

1 GB

Memory bus width

256 Bit

64 Bit

Memory clock speed

4200 MHz

1800 MHz

Memory bandwidth

134.4 GB/s

14.4 GB/s

Display Connectors

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

1x DVI, 1x HDMI, 1x VGA

HDMI

DirectX

11.2 (11_0)

12 (11_0)

CUDA

3.5

OpenCL

1.2

OpenGL

4.4

4.6

Shader Model

5.0

5.1

Vulkan

N/A

1.1.126