GeForce 840M and Radeon HD 4870 Mac Edition - video card comparison
GeForce 840M
Radeon HD 4870 Mac Edition
Architecture
Maxwell (2014−2018)
TeraScale (2005−2013)
GPU code name
N15S-GT
RV770
Market segment
Laptop
Desktop
Release date
March 2014
January 2009
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Supplementary power connectors
-
2x 6-pin
Boost clock speed
1124 MHz
-
Core clock speed
1029 MHz
750 MHz
Floating-point performance
863.2 gflops
1,200.0 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
-
956 million
Pipelines / CUDA cores
384
800
Power consumption (TDP)
33 Watt
150 Watt
Texture fill rate
17.98
30.00
Memory type
DDR3
GDDR5
Maximum RAM amount
4 GB
512 MB
Memory bus width
64 Bit
256 Bit
Memory clock speed
2000 MHz
3400 MHz
Memory bandwidth
16.02 GB/s
108.8 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x mini-DisplayPort
DirectX
12 (11_0)
10.1 (10_1)
CUDA
+
-
OpenCL
1.2
1.1
OpenGL
4.5
3.3
Shader Model
5.1
4.1
Vulkan
1.1.126
N/A
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-