GeForce GT 640M Mac Edition vs GeForce 840M
We compared two Mobile platform GPUs: 512MB VRAM GeForce GT 640M Mac Edition and 2GB VRAM GeForce 840M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
GeForce GT 640M Mac Edition 's Advantages
Larger VRAM bandwidth (40.00GB/s vs 16.02GB/s)
Lower TDP (32W vs 33W)
GeForce 840M 's Advantages
Released 1 years and 1 months late
Boost Clock1124MHz
More VRAM (2GB vs 512GB)
Score
Benchmark
FP32 (float)
GeForce GT 640M Mac Edition
572
GeForce 840M
+50%
863
Graphics Card
Feb 2013
Release Date
Mar 2014
GeForce 600M
Generation
GeForce 800M
Mobile
Type
Mobile
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x8
Clock Speeds
-
Base Clock
1029 MHz
-
Boost Clock
1124 MHz
1250 MHz
Memory Clock
1001 MHz
Memory
512MB
Memory Size
2GB
GDDR5
Memory Type
DDR3
64bit
Memory Bus
64bit
40.00GB/s
Bandwidth
16.02GB/s
Render Config
384
Shading Units
384
32
TMUs
16
8
ROPs
8
16 KB (per SMX)
L1 Cache
64 KB (per SMM)
128 KB
L2 Cache
1024 KB
Theoretical Performance
5.960 GPixel/s
Pixel Rate
8.992 GPixel/s
23.84 GTexel/s
Texture Rate
17.98 GTexel/s
572.2 GFLOPS
FP32 (float)
863.2 GFLOPS
23.84 GFLOPS
FP64 (double)
26.98 GFLOPS
Board Design
32W
TDP
33W
No outputs
Outputs
No outputs
Graphics Processor
GK107
GPU Name
GM108
N13P-GS
GPU Variant
N15S-GT
Kepler
Architecture
Maxwell
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
1.27 billion
Transistors
Unknown
118 mm²
Die Size
Unknown
Graphics Features
12 (11_0)
DirectX
12 (11_0)
4.6
OpenGL
4.6
3.0
OpenCL
3.0
1.1
Vulkan
1.3
3.0
CUDA
5.0
5.1
Shader Model
5.1
