GeForce GTX 660M and Mobility Radeon HD 3870 X2 - video card comparison
GeForce GTX 660M
Mobility Radeon HD 3870 X2
Architecture
Kepler (2012−2018)
RV6xx (2007−2010)
GPU code name
N13E-GE
M88-XT CF
Market segment
Laptop
Laptop
Release date
March 2012
September 2008
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
MXM-B (3.0)
PCIe 2.0 x16
SLI options
+
-
Boost clock speed
950 MHz
-
Core clock speed
835 MHz
660 MHz
CUDA cores
384
-
Floating-point performance
729.6 gflops
2x 422.4 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
1,270 million
666 million
Pipelines / CUDA cores
384
640
Power consumption (TDP)
50 Watt
110 Watt
Texture fill rate
30.4 billion/sec
10.56
Memory type
GDDR5
GDDR3
Maximum RAM amount
2 GB
512 MB
Memory bus width
128bit
256 Bit
Memory clock speed
2000 MHz
850 MHz
Memory bandwidth
64.0 GB/s
54.4 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
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
Optimus
+
-