Radeon R9 M275X and GeForce GTX 660M Mac Edition - video card comparison
Radeon R9 M275X
GeForce GTX 660M Mac Edition
Architecture
GCN 1.0 (2012−2020)
Kepler (2012−2018)
GPU code name
Venus
GK107
Market segment
Desktop
Desktop
Release date
January 2014
April 2013
Bus support
PCIe 3.0 x16
-
Interface
PCIe 3.0 x16
MXM-B (3.0)
Supplementary power connectors
-
None
Boost clock speed
925 MHz
-
Compute units
10
-
Core clock speed
900 MHz
950 MHz
Floating-point performance
1,184 gflops
729.6 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,500 million
1,270 million
Pipelines / CUDA cores
640
384
Power consumption (TDP)
-
50 Watt
Texture fill rate
37.00
30.40
Memory type
GDDR5
GDDR5
Maximum RAM amount
4 GB
512 MB
Memory bus width
128 Bit
128 Bit
Memory clock speed
1125 MHz
5000 MHz
Memory bandwidth
72 GB/s
80 GB/s
Display Connectors
No outputs
No outputs
Eyefinity
1
-
DirectX
DirectX® 11
12 (11_0)
CUDA
-
3.0
Mantle
+
-
OpenCL
Not Listed
1.2
OpenGL
4.4
4.6
Shader Model
5.1
5.1
Vulkan
-
1.1.126
AppAcceleration
-
-
DualGraphics
1
-
Enduro
-
-
FreeSync
1
-
HD3D
+
-
PowerTune
+
-
Switchable graphics
1
-
TrueAudio
-
-
ZeroCore
+
-