NVIDIA GeForce GTX 660M Mac Edition vs NVIDIA GeForce GT 645M
We compared two Mobile platform GPUs: 512MB VRAM GeForce GTX 660M Mac Edition and 2GB VRAM GeForce GT 645M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
NVIDIA GeForce GTX 660M Mac Edition 's Advantages
Released 6 months late
Larger VRAM bandwidth (80.00GB/s vs 28.80GB/s)
NVIDIA GeForce GT 645M 's Advantages
More VRAM (2GB vs 512GB)
Lower TDP (32W vs 50W)
Score
Benchmark
FP32 (float)
GeForce GTX 660M Mac Edition
+34%
0.73 TFLOPS
GeForce GT 645M
0.544 TFLOPS
Graphics Card
Apr 2013
Release Date
Oct 2012
GeForce 600M
Generation
GeForce 600M
Mobile
Type
Mobile
MXM-B (3.0)
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
-
-
-
-
-
1250 MHz
Memory Clock
900 MHz
Memory
512MB
Memory Size
2GB
GDDR5
Memory Type
DDR3
128bit
Memory Bus
128bit
80.00GB/s
Bandwidth
28.80GB/s
Render Config
-
-
-
-
-
-
384
Shading Units
384
32
TMUs
32
16
ROPs
16
-
-
-
-
-
-
16 KB (per SMX)
L1 Cache
16 KB (per SMX)
256 KB
L2 Cache
256 KB
-
-
-
Theoretical Performance
7.600 GPixel/s
Pixel Rate
5.672 GPixel/s
30.40 GTexel/s
Texture Rate
22.69 GTexel/s
-
-
-
729.6 GFLOPS
FP32 (float)
544.5 GFLOPS
30.40 GFLOPS
FP64 (double)
22.69 GFLOPS
Board Design
50W
TDP
32W
-
-
-
No outputs
Outputs
No outputs
None
Power Connectors
-
Graphics Processor
GK107
GPU Name
GK107
-
GPU Variant
N13P-GS
Kepler
Architecture
Kepler
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
1.27 billion
Transistors
1.27 billion
118 mm²
Die Size
118 mm²
Graphics Features
12 (11_0)
DirectX
12 (11_0)
4.6
OpenGL
4.6
3.0
OpenCL
3.0
1.1
Vulkan
1.1
3.0
CUDA
3.0
5.1
Shader Model
5.1
