NVIDIA GeForce GTX 660 vs AMD Radeon R9 390X
GPU · Specs Compare
Graphics Card
Release Date
Sep 2012
Jun 2015
Generation
GeForce 600
Pirate Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Base Clock
980 MHz
—
Boost Clock
1032 MHz
—
Memory Clock
1502 MHz
1500 MHz
Memory
Memory Size
2GB
8GB
Memory Type
GDDR5
GDDR5
Memory Bus
192bit
512bit
Bandwidth
144.2GB/s
384.0GB/s
Render Config
Shading Units
960
2816
TMUs
80
176
ROPs
24
64
L1 Cache
16 KB (per SMX)
16 KB (per CU)
L2 Cache
384 KB
1024 KB
Compute Units
—
44
Theoretical Performance
Pixel Rate
20.64 GPixel/s
67.20 GPixel/s
Texture Rate
82.56 GTexel/s
184.8 GTexel/s
FP32 (float)
1.981 TFLOPS
5.914 TFLOPS
FP64 (double)
82.56 GFLOPS
739.2 GFLOPS
Graphics Processor
GPU Name
GK106
Grenada
GPU Variant
GK106-400-A1
Grenada XT(215-0880004)
Architecture
Kepler
GCN 2.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
2.54 billion
6.2 billion
Die Size
221 mm²
438 mm²
Board Design
TDP
140W
275W
Suggested PSU
300 W
600 W
Outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Power Connectors
1x 6-pin
1x 6-pin + 1x 8-pin
Graphics Features
DirectX
12 (11_0)
12 (12_0)
OpenGL
4.6
4.6
OpenCL
3.0
2.0
Vulkan
1.1
1.2
CUDA
3.0
—
Shader Model
5.1
6.3
Benchmark
3DMark Time Spy
1,194
—
3DMark Time Spy Extreme
260
—
OctaneBench
27
—
Blender
111
—
▲ Specs Compare
Data sourced from official specifications and benchmark tests.