GeForce GTX 850M and GeForce GT 640M - video card comparison
Passmark - benchmark score GeForce GTX 850M vs GeForce GT 640M
GeForce GTX 850M
2591
GeForce GT 640M
946
GeForce GTX 850M
GeForce GT 640M
Architecture
Maxwell (2014−2018)
Kepler (2012−2018)
GPU code name
N15P-GT
N13P-GS
Market segment
Laptop
Laptop
Release date
March 2014
March 2012
Bus support
PCI Express 2.0, PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x16
SLI options
+
-
Boost clock speed
-
645 MHz
Core clock speed
Up to 936 MHz
Up to 625 MHz
CUDA cores
640
384
Floating-point performance
1,155 gflops
480.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,870 million
1,270 million
Pipelines / CUDA cores
640
384
Power consumption (TDP)
45 Watt
32 Watt
Texture fill rate
36.08
Up to 20.0 billion/sec
Memory type
DDR3, GDDR5
DDR3\GDDR5
Maximum RAM amount
4 GB
2 GB
Memory bus width
128 Bit
128bit
Memory clock speed
Up to 2500 MHz
1800 - 4000 MHz
Memory bandwidth
80.0 GB/s
Up to 64.0 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
+
-
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
12 (11_0)
12 API
CUDA
+
+
OpenCL
1.1
1.1
OpenGL
4.5
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
3D Blu-Ray
-
+
Ansel
+
-
H.264, VC1, MPEG2 1080p video decoder
+
-
Optimus
+
+
TrueHD and DTS-HD audio bitstreaming
+
-