Mobility Radeon HD 3870 X2 and GeForce GT 555M - video card comparison
Mobility Radeon HD 3870 X2
GeForce GT 555M
Architecture
RV6xx (2007−2010)
Fermi (2010−2014)
GPU code name
M88-XT CF
N12E-GE-B
Market segment
Laptop
Laptop
Release date
September 2008
January 2011
Bus support
-
PCI Express 2.0
Interface
PCIe 2.0 x16
PCIe 2.0 x16
SLI options
-
+
Boost clock speed
-
753 MHz
Core clock speed
660 MHz
Up to 753 MHz
CUDA cores
-
Up to 144
Floating-point performance
2x 422.4 gflops
388.8 gflops
Manufacturing process technology
55 nm
40 nm
Number of transistors
666 million
1,170 million
Pipelines / CUDA cores
640
144
Power consumption (TDP)
110 Watt
35 Watt
Texture fill rate
10.56
Up to 16.2 billion/sec
Memory type
GDDR3
DDR3\DDR5
Maximum RAM amount
512 MB
3 GB
Memory bus width
256 Bit
Up to 192 bit/128 Bit
Memory clock speed
850 MHz
Up to 1569 MHz
Memory bandwidth
54.4 GB/s
Up to 50.2 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
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
N/A
3D Blu-Ray
-
+
3D Gaming
-
+
Optimus
-
+