Radeon R9 M390 and Radeon HD 6990M - video card comparison
Radeon R9 M390
Radeon HD 6990M
Architecture
GCN (2011−2017)
Terascale 2 (2009−2015)
GPU code name
Pitcairn
Blackcomb XTX
Market segment
Laptop
Laptop
Release date
June 2015
July 2011
Bus support
PCIe 3.0
-
Interface
-
MXM-B (3.0)
Supplementary power connectors
-
None
Core clock speed
-
715 MHz
Floating-point performance
-
1,601.6 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
5000 Million
1,700 million
Pipelines / CUDA cores
1024
1120
Power consumption (TDP)
-
100 Watt
Texture fill rate
-
40.04
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
-
900 MHz
Memory bandwidth
-
115.2 GB/s
Shared memory
-
-
Display Connectors
-
No outputs
Eyefinity
1
-
DirectX
DirectX® 12
11.2 (11_0)
Mantle
+
-
OpenCL
Not Listed
1.2
OpenGL
4.4
4.4
Shader Model
-
5.0
Vulkan
-
N/A
AppAcceleration
-
-
DualGraphics
1
-
Enduro
-
-
FreeSync
1
-
HD3D
+
-
PowerTune
+
-
Switchable graphics
1
-
TrueAudio
-
-
ZeroCore
+
-