GeForce GTX 880M and GeForce GT 640M LE - video card comparison
Passmark - benchmark score GeForce GTX 880M vs GeForce GT 640M LE
GeForce GTX 880M
3917
GeForce GT 640M LE
720
GeForce GTX 880M
GeForce GT 640M LE
Architecture
Kepler (2012−2018)
Fermi / Kepler (2012)
GPU code name
N15E-GX-A2
N13P-LP
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
MXM-B (3.0)
PCIe 2.0 x16
Supplementary power connectors
None
-
SLI options
+
-
Boost clock speed
993 MHz
-
Core clock speed
954 MHz
Up to 500 MHz
CUDA cores
1536
Up to 384
Floating-point performance
3,050 gflops
384.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
3,540 million
585 million
Pipelines / CUDA cores
1536
384
Power consumption (TDP)
122 Watt
20 Watt
Texture fill rate
127.1
Up to 16.0 billion/sec
Memory type
GDDR5
DDR3\DDR5
Maximum RAM amount
8 GB
2 GB
Memory bus width
256 Bit
128bit
Memory clock speed
Up to 2500 MHz
1800 - 4000 MHz
Memory bandwidth
160.0 GB/s
Up to 28.8 GB/s
Shared memory
-
-
Standard memory configuration
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
N/A
3D Blu-Ray
-
+
H.264, VC1, MPEG2 1080p video decoder
+
-
Optimus
+
+
TrueHD and DTS-HD audio bitstreaming
+
-