Mobility Radeon HD 4870 X2 and GeForce 845M - video card comparison

Mobility Radeon HD 4870 X2

GeForce 845M

Architecture

Terascale 1 (2008−2010)

Maxwell (2014−2018)

GPU code name

M98-XT

GM108

Market segment

Laptop

Release date

January 2009

March 2014

Interface

PCIe 2.0 x16

PCIe 3.0 x8

Boost clock speed

1150 MHz

Core clock speed

550 MHz

1071 MHz

Floating-point performance

2x 880.0 gflops

883.7 gflops

Manufacturing process technology

55 nm

28 nm

Number of transistors

956 million

1,870 million

Pipelines / CUDA cores

1600

384

Power consumption (TDP)

45 Watt

Texture fill rate

22.00

37.63

Memory type

GDDR3, GDDR5

DDR3, GDDR5

Maximum RAM amount

2 GB

Memory bus width

256 Bit

64/128 Bit

Memory clock speed

888 MHz

2000 - 5000 MHz

Memory bandwidth

89.6 GB/s

40.1 GB/s

Shared memory

Display Connectors

No outputs

DirectX

10.1 (10_1)

12 (11_0)

CUDA

OpenCL

1.1

1.2

OpenGL

3.3

4.6

Shader Model

4.1

5.1

Vulkan

N/A

1.1.126

Optimus