GeForce 840M and Radeon HD 7970 GHz Edition - video card comparison
GeForce 840M
Radeon HD 7970 GHz Edition
Architecture
Maxwell (2014−2018)
GCN 1.0 (2012−2020)
GPU code name
N15S-GT
Tahiti
Market segment
Laptop
Desktop
Release date
March 2014
June 2012
Bus support
PCI Express 2.0, PCI Express 3.0
PCIe 2.1 x16
Interface
PCIe 3.0 x8
PCIe 3.0 x16
Supplementary power connectors
-
1x 6-pin + 1x 8-pin
Boost clock speed
1124 MHz
1050 MHz
Core clock speed
1029 MHz
-
Floating-point performance
863.2 gflops
4,301 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
-
4,313 million
Pipelines / CUDA cores
384
2048
Power consumption (TDP)
33 Watt
250 Watt
Texture fill rate
17.98
134.4
Memory type
DDR3
GDDR5
Maximum RAM amount
4 GB
3 GB
Memory bus width
64 Bit
384 Bit
Memory clock speed
2000 MHz
1500 MHz
Memory bandwidth
16.02 GB/s
288 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 2x mini-DisplayPort
Eyefinity
-
1
HDMI
-
+
DisplayPort support
-
-
DirectX
12 (11_0)
DirectX® 11
CUDA
+
-
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.5
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
-
AppAcceleration
-
-
CrossFire
-
1
Enduro
-
-
FreeSync
-
1
GameWorks
+
-
GPU Boost
2.0
-
HD3D
-
-
Optimus
+
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-