Home GPU Comparison NVIDIA GeForce 840M vs NVIDIA GeForce GTX 660M Mac Edition

NVIDIA GeForce 840M vs NVIDIA GeForce GTX 660M Mac Edition

We compared two Mobile platform GPUs: 2GB VRAM GeForce 840M and 512MB VRAM GeForce GTX 660M Mac Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce 840M 's Advantages
Released 11 months late
Boost Clock1124MHz
More VRAM (2GB vs 512GB)
Lower TDP (33W vs 50W)
NVIDIA GeForce GTX 660M Mac Edition 's Advantages
Larger VRAM bandwidth (80.00GB/s vs 16.02GB/s)

Score

Benchmark

FP32 (float)
GeForce 840M +18%
0.863 TFLOPS
GeForce GTX 660M Mac Edition
0.73 TFLOPS
VS

Graphics Card

Mar 2014
Release Date
Apr 2013
GeForce 800M
Generation
GeForce 600M
Mobile
Type
Mobile
PCIe 3.0 x8
Bus Interface
MXM-B (3.0)

Clock Speeds

1029 MHz
Base Clock
-
1124 MHz
Boost Clock
-
1001 MHz
Memory Clock
1250 MHz

Memory

2GB
Memory Size
512MB
DDR3
Memory Type
GDDR5
64bit
Memory Bus
128bit
16.02GB/s
Bandwidth
80.00GB/s

Render Config

-
-
-
-
-
-
384
Shading Units
384
16
TMUs
32
8
ROPs
16
-
-
-
-
-
-
64 KB (per SMM)
L1 Cache
16 KB (per SMX)
1024 KB
L2 Cache
256 KB
-
-
-

Theoretical Performance

8.992 GPixel/s
Pixel Rate
7.600 GPixel/s
17.98 GTexel/s
Texture Rate
30.40 GTexel/s
-
-
-
863.2 GFLOPS
FP32 (float)
729.6 GFLOPS
26.98 GFLOPS
FP64 (double)
30.40 GFLOPS

Board Design

33W
TDP
50W
-
-
-
No outputs
Outputs
No outputs
-
Power Connectors
None

Graphics Processor

GM108
GPU Name
GK107
N15S-GT
GPU Variant
-
Maxwell
Architecture
Kepler
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
Unknown
Transistors
1.27 billion
Unknown
Die Size
118 mm²

Graphics Features

12 (11_0)
DirectX
12 (11_0)
4.6
OpenGL
4.6
3.0
OpenCL
3.0
1.3
Vulkan
1.1
5.0
CUDA
3.0
5.1
Shader Model
5.1

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