NVIDIA GeForce GT 820M vs NVIDIA GeForce GT 645M
We compared two Mobile platform GPUs: 1024MB VRAM GeForce GT 820M 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 GT 820M 's Advantages
Released 1 years and 1 months late
Lower TDP (15W vs 32W)
NVIDIA GeForce GT 645M 's Advantages
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (28.80GB/s vs 14.40GB/s)
288 additional rendering cores
Score
Benchmark
FP32 (float)
GeForce GT 820M
0.298 TFLOPS
GeForce GT 645M
+82%
0.544 TFLOPS
Graphics Card
Nov 2013
Release Date
Oct 2012
GeForce 800M
Generation
GeForce 600M
Mobile
Type
Mobile
PCIe 2.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
-
-
-
-
-
900 MHz
Memory Clock
900 MHz
Memory
1024MB
Memory Size
2GB
DDR3
Memory Type
DDR3
64bit
Memory Bus
128bit
14.40GB/s
Bandwidth
28.80GB/s
Render Config
-
-
-
2
SM Count
-
96
Shading Units
384
16
TMUs
32
8
ROPs
16
-
-
-
-
-
-
64 KB (per SM)
L1 Cache
16 KB (per SMX)
128 KB
L2 Cache
256 KB
-
-
-
Theoretical Performance
3.100 GPixel/s
Pixel Rate
5.672 GPixel/s
12.40 GTexel/s
Texture Rate
22.69 GTexel/s
-
-
-
297.6 GFLOPS
FP32 (float)
544.5 GFLOPS
24.80 GFLOPS
FP64 (double)
22.69 GFLOPS
Board Design
15W
TDP
32W
-
-
-
No outputs
Outputs
No outputs
-
-
-
Graphics Processor
GF117
GPU Name
GK107
N15V-GM
GPU Variant
N13P-GS
Fermi 2.0
Architecture
Kepler
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
0.585 billion
Transistors
1.27 billion
116 mm²
Die Size
118 mm²
Graphics Features
12 (11_0)
DirectX
12 (11_0)
4.6
OpenGL
4.6
1.1
OpenCL
3.0
N/A
Vulkan
1.1
2.1
CUDA
3.0
5.1
Shader Model
5.1
