Mobility Radeon HD 3850 and GeForce GT 640M - video card comparison
Mobility Radeon HD 3850
GeForce GT 640M
Architecture
RV6xx (2007−2010)
Kepler (2012−2018)
GPU code name
M88
N13P-GS
Market segment
Laptop
Laptop
Release date
December 2007
March 2012
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Boost clock speed
-
645 MHz
Core clock speed
580 MHz
Up to 625 MHz
CUDA cores
-
384
Floating-point performance
371.2 gflops
480.0 gflops
Manufacturing process technology
55 nm
28 nm
Number of transistors
666 million
1,270 million
Pipelines / CUDA cores
320
384
Power consumption (TDP)
55 Watt
32 Watt
Texture fill rate
9.280
Up to 20.0 billion/sec
Memory type
GDDR3
DDR3\GDDR5
Maximum RAM amount
512 MB
2 GB
Memory bus width
256 Bit
128bit
Memory clock speed
750 MHz
1800 - 4000 MHz
Memory bandwidth
48 GB/s
Up to 64.0 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
10.1 (10_1)
12 API
CUDA
-
+
OpenCL
N/A
1.1
OpenGL
3.3
4.5
Shader Model
4.1
5.1
Vulkan
N/A
1.1.126
3D Blu-Ray
-
+
Optimus
-
+