GeForce GT 555M and Radeon HD 6770M Mac Edition - video card comparison
GeForce GT 555M
Radeon HD 6770M Mac Edition
Architecture
Fermi (2010−2014)
TeraScale 2 (2009−2015)
GPU code name
N12E-GE-B
Whistler
Market segment
Laptop
Desktop
Release date
January 2011
January 2011
Bus support
PCI Express 2.0
-
Interface
PCIe 2.0 x16
MXM-A (3.0)
SLI options
+
-
Boost clock speed
753 MHz
-
Core clock speed
Up to 753 MHz
725 MHz
CUDA cores
Up to 144
-
Floating-point performance
388.8 gflops
696.0 gflops
Manufacturing process technology
40 nm
40 nm
Number of transistors
1,170 million
716 million
Pipelines / CUDA cores
144
480
Power consumption (TDP)
35 Watt
35 Watt
Texture fill rate
Up to 16.2 billion/sec
17.40
Memory type
DDR3\DDR5
GDDR5
Maximum RAM amount
3 GB
512 MB
Memory bus width
Up to 192 bit/128 Bit
128 Bit
Memory clock speed
Up to 1569 MHz
3600 MHz
Memory bandwidth
Up to 50.2 GB/s
57.6 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 API
11.2 (11_0)
CUDA
+
-
OpenCL
1.1
1.2
OpenGL
4.5
4.4
Shader Model
5.1
5.0
Vulkan
N/A
N/A
3D Blu-Ray
+
-
3D Gaming
+
-
Optimus
+
-