Radeon HD 7870 and GeForce GTX 660M Mac Edition - video card comparison
Radeon HD 7870
GeForce GTX 660M Mac Edition
Architecture
GCN (2011−2017)
Kepler (2012−2018)
GPU code name
Pitcairn XT
GK107
Market segment
Desktop
Desktop
Release date
March 2012
April 2013
Interface
PCIe 3.0 x16
MXM-B (3.0)
Supplementary power connectors
2x 6-pin
None
Core clock speed
1000 MHz
950 MHz
Floating-point performance
-
729.6 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2800 Million
1,270 million
Pipelines / CUDA cores
1280
384
Power consumption (TDP)
175 Watt
50 Watt
Texture fill rate
80.00
30.40
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
512 MB
Memory bus width
256 Bit
128 Bit
Memory clock speed
4800 MHz
5000 MHz
Memory bandwidth
153.6 GB/s
80 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
No outputs
Eyefinity
+
-
HDMI
+
-
DirectX
12 (11_1)
12 (11_0)
CUDA
-
3.0
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.2.131
1.1.126