Radeon R9 285 and GeForce GT 640M Mac Edition - video card comparison
Radeon R9 285
GeForce GT 640M Mac Edition
Architecture
GCN 3.0 (2014−2017)
Kepler (2012−2018)
GPU code name
Tonga
GK107
Market segment
Desktop
Desktop
Release date
September 2014
February 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 6-pin
-
Core clock speed
918 MHz
745 MHz
Floating-point performance
3,290 gflops
572.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
5,000 million
1,270 million
Pipelines / CUDA cores
1792
384
Power consumption (TDP)
190 Watt
32 Watt
Texture fill rate
102.8
23.84
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
512 MB
Memory bus width
256 Bit
64 Bit
Memory clock speed
5.5 GB/s
5000 MHz
Memory bandwidth
176.0 GB/s
40 GB/s
Display Connectors
2x DVI, 1x HDMI 1.4a, 1x DisplayPort 1.2
No outputs
HDMI
+
-
DirectX
12 (12_0)
12 (11_0)
CUDA
-
3.0
OpenCL
2.1
1.2
OpenGL
4.6
4.6
Shader Model
6.5
5.1
Vulkan
1.2.170
1.1.126