AMD Radeon R9 M395X Mac Edition vs NVIDIA GeForce GTX 660 Rev. 2
GPU · Specs Compare
Graphics Card
Release Date
May 2015
Sep 2014
Generation
Crystal System
GeForce 600
Type
Mobile
Desktop
Bus Interface
MXM-B (3.0)
PCIe 3.0 x16
Clock Speeds
Memory Clock
1365 MHz
1502 MHz
Base Clock
—
980 MHz
Boost Clock
—
1032 MHz
Memory
Memory Size
4GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
192bit
Bandwidth
174.7GB/s
144.2GB/s
Render Config
Compute Units
32
—
Shading Units
2048
960
TMUs
128
80
ROPs
32
24
L1 Cache
16 KB (per CU)
16 KB (per SMX)
L2 Cache
512 KB
384 KB
Theoretical Performance
Pixel Rate
29.09 GPixel/s
20.64 GPixel/s
Texture Rate
116.4 GTexel/s
82.56 GTexel/s
FP16 (half)
3.723 TFLOPS
—
FP32 (float)
3.723 TFLOPS
1.981 TFLOPS
FP64 (double)
232.7 GFLOPS
82.56 GFLOPS
Graphics Processor
GPU Name
Amethyst
GK104
GPU Variant
Amethyst XT
—
Architecture
GCN 3.0
Kepler
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
5 billion
3.54 billion
Die Size
366 mm²
294 mm²
Board Design
TDP
250W
140W
Outputs
No outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Power Connectors
None
1x 6-pin
Suggested PSU
—
300 W
Graphics Features
DirectX
12 (12_0)
12 (11_0)
OpenGL
4.6
4.6
OpenCL
2.0
3.0
Vulkan
1.2
1.1
Shader Model
6.3
5.1
CUDA
—
3.0
▲ Specs Compare
Data sourced from official specifications and benchmark tests.