GeForce GTX 870M and GeForce GT 640 - video card comparison
Passmark - benchmark score GeForce GTX 870M vs GeForce GT 640
GeForce GTX 870M
3552
GeForce GT 640
1209
GeForce GTX 870M
GeForce GT 640
Architecture
Kepler (2012−2018)
Kepler (2012−2018)
GPU code name
N15P-GT
GK107
Market segment
Laptop
Desktop
Release date
March 2014
June 2012
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
MXM-B (3.0)
PCIe 3.0 x16
Supplementary power connectors
None
None
SLI options
+
-
Boost clock speed
967 MHz
-
Core clock speed
941 MHz
902 MHz
CUDA cores
1344
-
Floating-point performance
2,599 gflops
692.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
3,540 million
1,270 million
Pipelines / CUDA cores
1344
384
Power consumption (TDP)
100 Watt
65 Watt
Texture fill rate
108.3
28.86
Memory type
GDDR5
DDR3
Maximum RAM amount
6 GB
2 GB
Memory bus width
192 Bit
128 Bit
Memory clock speed
Up to 2500 MHz
1782 MHz
Memory bandwidth
120.0 GB/s
28.51 GB/s
Shared memory
-
-
Standard memory configuration
GDDR5
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x DisplayPort
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)
12 (11_0)
CUDA
+
3.0
OpenCL
1.1
1.2
OpenGL
4.5
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
H.264, VC1, MPEG2 1080p video decoder
+
-
Optimus
+
-
TrueHD and DTS-HD audio bitstreaming
+
-