GeForce 845M and Mobility Radeon HD 3870 X2 - video card comparison
GeForce 845M
Mobility Radeon HD 3870 X2
Architecture
Maxwell (2014−2018)
RV6xx (2007−2010)
GPU code name
GM108
M88-XT CF
Market segment
Laptop
Laptop
Release date
March 2014
September 2008
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Boost clock speed
1150 MHz
-
Core clock speed
1071 MHz
660 MHz
Floating-point performance
883.7 gflops
2x 422.4 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
1,870 million
666 million
Pipelines / CUDA cores
384
640
Power consumption (TDP)
45 Watt
110 Watt
Texture fill rate
37.63
10.56
Memory type
DDR3, GDDR5
GDDR3
Maximum RAM amount
2 GB
512 MB
Memory bus width
64/128 Bit
256 Bit
Memory clock speed
2000 - 5000 MHz
850 MHz
Memory bandwidth
40.1 GB/s
54.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
10.1 (10_1)
CUDA
+
-
OpenCL
1.2
N/A
OpenGL
4.6
3.3
Shader Model
5.1
4.1
Vulkan
1.1.126
N/A
Optimus
+
-