GeForce GTX 850M and Mobility Radeon HD 3870 X2 - video card comparison
GeForce GTX 850M
Mobility Radeon HD 3870 X2
Architecture
Maxwell (2014−2018)
RV6xx (2007−2010)
GPU code name
N15P-GT
M88-XT CF
Market segment
Laptop
Laptop
Release date
March 2014
September 2008
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 2.0 x16
SLI options
+
-
Core clock speed
Up to 936 MHz
660 MHz
CUDA cores
640
-
Floating-point performance
1,155 gflops
2x 422.4 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
1,870 million
666 million
Pipelines / CUDA cores
640
640
Power consumption (TDP)
45 Watt
110 Watt
Texture fill rate
36.08
10.56
Memory type
DDR3, GDDR5
GDDR3
Maximum RAM amount
4 GB
512 MB
Memory bus width
128 Bit
256 Bit
Memory clock speed
Up to 2500 MHz
850 MHz
Memory bandwidth
80.0 GB/s
54.4 GB/s
Shared memory
-
-
Standard memory configuration
DDR3 or GDDR5
-
Display Connectors
No outputs
No outputs
eDP 1.2 signal support
Up to 3840x2160
-
LVDS signal support
Up to 1920x1200
-
VGA аnalog display support
Up to 2048x1536
-
DisplayPort Multimode (DP++) support
Up to 3840x2160
-
HDCP content protection
+
-
HDMI
+
-
7.1 channel HD audio on HDMI
+
-
DirectX
12 (11_0)
10.1 (10_1)
CUDA
+
-
OpenCL
1.1
N/A
OpenGL
4.5
3.3
Shader Model
5.1
4.1
Vulkan
1.1.126
N/A
Ansel
+
-
H.264, VC1, MPEG2 1080p video decoder
+
-
Optimus
+
-
TrueHD and DTS-HD audio bitstreaming
+
-