NVIDIA GeForce GT 820M vs NVIDIA GeForce 840A
We compared two Mobile platform GPUs: 1024MB VRAM GeForce GT 820M and 2GB VRAM GeForce 840A to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
NVIDIA GeForce GT 820M 's Advantages
Lower TDP (15W vs 33W)
NVIDIA GeForce 840A 's Advantages
Boost Clock1124MHz
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (16.02GB/s vs 14.40GB/s)
288 additional rendering cores
Score
Benchmark
FP32 (float)
GeForce GT 820M
0.298 TFLOPS
GeForce 840A
+189%
0.863 TFLOPS
Graphics Card
Nov 2013
Release Date
Mar 2014
GeForce 800M
Generation
GeForce 800A
Mobile
Type
Mobile
PCIe 2.0 x16
Bus Interface
PCIe 3.0 x8
Clock Speeds
-
Base Clock
1029 MHz
-
Boost Clock
1124 MHz
900 MHz
Memory Clock
1001 MHz
Memory
1024MB
Memory Size
2GB
DDR3
Memory Type
DDR3
64bit
Memory Bus
64bit
14.40GB/s
Bandwidth
16.02GB/s
Render Config
-
-
-
2
SM Count
-
96
Shading Units
384
16
TMUs
16
8
ROPs
8
-
-
-
-
-
-
64 KB (per SM)
L1 Cache
64 KB (per SMM)
128 KB
L2 Cache
1024 KB
-
-
-
Theoretical Performance
3.100 GPixel/s
Pixel Rate
8.992 GPixel/s
12.40 GTexel/s
Texture Rate
17.98 GTexel/s
-
-
-
297.6 GFLOPS
FP32 (float)
863.2 GFLOPS
24.80 GFLOPS
FP64 (double)
26.98 GFLOPS
Board Design
15W
TDP
33W
-
-
-
No outputs
Outputs
No outputs
-
-
-
Graphics Processor
GF117
GPU Name
GM108
N15V-GM
GPU Variant
-
Fermi 2.0
Architecture
Maxwell
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
0.585 billion
Transistors
Unknown
116 mm²
Die Size
Unknown
Graphics Features
12 (11_0)
DirectX
12 (11_0)
4.6
OpenGL
4.6
1.1
OpenCL
3.0
N/A
Vulkan
1.3
2.1
CUDA
5.0
5.1
Shader Model
5.1
