NVIDIA GeForce GTX 660 vs AMD Radeon HD 6950
GPU · Specs Compare
Graphics Card
Release Date
Sep 2012
Dec 2010
Generation
GeForce 600
Northern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 2.0 x16
Clock Speeds
Base Clock
980 MHz
—
Boost Clock
1032 MHz
—
Memory Clock
1502 MHz
1250 MHz
Memory
Memory Size
2GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
192bit
256bit
Bandwidth
144.2GB/s
160.0GB/s
Render Config
Shading Units
960
1408
TMUs
80
88
ROPs
24
32
L1 Cache
16 KB (per SMX)
8 KB (per CU)
L2 Cache
384 KB
512 KB
Compute Units
—
22
Theoretical Performance
Pixel Rate
20.64 GPixel/s
25.60 GPixel/s
Texture Rate
82.56 GTexel/s
70.40 GTexel/s
FP32 (float)
1.981 TFLOPS
2.253 TFLOPS
FP64 (double)
82.56 GFLOPS
563.2 GFLOPS
Graphics Processor
GPU Name
GK106
Cayman
GPU Variant
GK106-400-A1
Cayman PRO(215-0807019)
Architecture
Kepler
TeraScale 3
Foundry
TSMC
TSMC
Process Size
28 nm
40 nm
Transistors
2.54 billion
2.64 billion
Die Size
221 mm²
389 mm²
Board Design
TDP
140W
200W
Suggested PSU
300 W
550 W
Outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
2x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Power Connectors
1x 6-pin
2x 6-pin
Graphics Features
DirectX
12 (11_0)
11.2 (11_0)
OpenGL
4.6
4.4
OpenCL
3.0
1.2
Vulkan
1.1
N/A
CUDA
3.0
—
Shader Model
5.1
5.0
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.