NVIDIA GeForce GT 820M vs NVIDIA GeForce GT 640 OEM

Comparative analysis of NVIDIA GeForce GT 820M and NVIDIA GeForce GT 640 OEM videocards for all known characteristics in the following categories: Essentials, Technical info, Video outputs and ports, Compatibility, dimensions and requirements, API support, Memory. Benchmark videocards performance analysis: PassMark - G3D Mark, PassMark - G2D Mark, Geekbench - OpenCL, CompuBench 1.5 Desktop - Face Detection (mPixels/s), CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s), CompuBench 1.5 Desktop - T-Rex (Frames/s), CompuBench 1.5 Desktop - Video Composition (Frames/s), CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s), GFXBench 4.0 - Car Chase Offscreen (Frames), GFXBench 4.0 - Manhattan (Frames), GFXBench 4.0 - T-Rex (Frames), GFXBench 4.0 - Car Chase Offscreen (Fps), GFXBench 4.0 - Manhattan (Fps), GFXBench 4.0 - T-Rex (Fps).

NVIDIA GeForce GT 820M

NVIDIA GeForce GT 640 OEM

Differences

Reasons to consider the NVIDIA GeForce GT 820M

Videocard is newer: launch date 1 year(s) 7 month(s) later
3.3x lower typical power consumption: 15 Watt vs 50 Watt
Around 1% higher memory clock speed: 1800 MHz vs 1782 MHz
Around 16% better performance in CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s): 17.753 vs 15.32
Around 14% better performance in GFXBench 4.0 - Manhattan (Frames): 2479 vs 2167
Around 14% better performance in GFXBench 4.0 - Manhattan (Fps): 2479 vs 2167

Specifications (specs)
Launch date	27 November 2013 vs 24 April 2012
Thermal Design Power (TDP)	15 Watt vs 50 Watt
Memory clock speed	1800 MHz vs 1782 MHz
Benchmarks
CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)	17.753 vs 15.32
GFXBench 4.0 - Manhattan (Frames)	2479 vs 2167
GFXBench 4.0 - Manhattan (Fps)	2479 vs 2167

Reasons to consider the NVIDIA GeForce GT 640 OEM

Around 3% higher core clock speed: 797 MHz vs 775 MHz
2.1x more texture fill rate: 25.5 GTexel / s vs 12.4 GTexel / s
4x more pipelines: 384 vs 96
2.1x better floating-point performance: 612.1 gflops vs 297.6 gflops
2x more maximum memory size: 2 GB vs 1 GB
3.7x better performance in CompuBench 1.5 Desktop - Face Detection (mPixels/s): 9.932 vs 2.692
Around 58% better performance in CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s): 254.345 vs 161.29
2.1x better performance in CompuBench 1.5 Desktop - T-Rex (Frames/s): 1.14 vs 0.55
Around 15% better performance in CompuBench 1.5 Desktop - Video Composition (Frames/s): 13.613 vs 11.858
Around 19% better performance in GFXBench 4.0 - Car Chase Offscreen (Frames): 1502 vs 1263
Around 19% better performance in GFXBench 4.0 - Car Chase Offscreen (Fps): 1502 vs 1263

Specifications (specs)
Core clock speed	797 MHz vs 775 MHz
Texture fill rate	25.5 GTexel / s vs 12.4 GTexel / s
Pipelines	384 vs 96
Floating-point performance	612.1 gflops vs 297.6 gflops
Maximum memory size	2 GB vs 1 GB
Benchmarks
CompuBench 1.5 Desktop - Face Detection (mPixels/s)	9.932 vs 2.692
CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)	254.345 vs 161.29
CompuBench 1.5 Desktop - T-Rex (Frames/s)	1.14 vs 0.55
CompuBench 1.5 Desktop - Video Composition (Frames/s)	13.613 vs 11.858
GFXBench 4.0 - Car Chase Offscreen (Frames)	1502 vs 1263
GFXBench 4.0 - T-Rex (Frames)	3334 vs 3327
GFXBench 4.0 - Car Chase Offscreen (Fps)	1502 vs 1263
GFXBench 4.0 - T-Rex (Fps)	3334 vs 3327

Compare benchmarks

GPU 1: NVIDIA GeForce GT 820M
GPU 2: NVIDIA GeForce GT 640 OEM

CompuBench 1.5 Desktop - Face Detection (mPixels/s)

GPU 1

GPU 2

2.692

9.932

CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)

GPU 1

GPU 2

161.29

254.345

CompuBench 1.5 Desktop - T-Rex (Frames/s)

GPU 1

GPU 2

0.55

1.14

CompuBench 1.5 Desktop - Video Composition (Frames/s)

GPU 1

GPU 2

11.858

13.613

CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)

GPU 1

GPU 2

17.753

15.32

GFXBench 4.0 - Car Chase Offscreen (Frames)

GPU 1

GPU 2

1263

1502

GFXBench 4.0 - Manhattan (Frames)

GPU 1

GPU 2

2479

2167

GFXBench 4.0 - T-Rex (Frames)

GPU 1

GPU 2

3327

3334

GFXBench 4.0 - Car Chase Offscreen (Fps)

GPU 1

GPU 2

1263

1502

GFXBench 4.0 - Manhattan (Fps)

GPU 1

GPU 2

2479

2167

GFXBench 4.0 - T-Rex (Fps)

GPU 1

GPU 2

3327

3334

Name	NVIDIA GeForce GT 820M	NVIDIA GeForce GT 640 OEM
PassMark - G3D Mark	551
PassMark - G2D Mark	144
Geekbench - OpenCL	2530
CompuBench 1.5 Desktop - Face Detection (mPixels/s)	2.692	9.932
CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)	161.29	254.345
CompuBench 1.5 Desktop - T-Rex (Frames/s)	0.55	1.14
CompuBench 1.5 Desktop - Video Composition (Frames/s)	11.858	13.613
CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)	17.753	15.32
GFXBench 4.0 - Car Chase Offscreen (Frames)	1263	1502
GFXBench 4.0 - Manhattan (Frames)	2479	2167
GFXBench 4.0 - T-Rex (Frames)	3327	3334
GFXBench 4.0 - Car Chase Offscreen (Fps)	1263	1502
GFXBench 4.0 - Manhattan (Fps)	2479	2167
GFXBench 4.0 - T-Rex (Fps)	3327	3334

Compare specifications (specs)

	NVIDIA GeForce GT 820M	NVIDIA GeForce GT 640 OEM
Essentials
Architecture	Fermi 2.0	Kepler
Code name	GF117	GK107
Launch date	27 November 2013	24 April 2012
Place in performance rating	1366	1368
Type	Desktop	Desktop
Technical info
Core clock speed	775 MHz	797 MHz
Floating-point performance	297.6 gflops	612.1 gflops
Manufacturing process technology	28 nm	28 nm
Pipelines	96	384
Texture fill rate	12.4 GTexel / s	25.5 GTexel / s
Thermal Design Power (TDP)	15 Watt	50 Watt
Transistor count	585 million	1,270 million
Video outputs and ports
Display Connectors	No outputs	1x DVI, 1x HDMI, 1x DisplayPort
Compatibility, dimensions and requirements
Interface	PCIe 2.0 x16	PCIe 3.0 x16
Length		145 mm
Supplementary power connectors		None
API support
DirectX	12.0 (11_0)	12.0 (11_0)
OpenGL	4.6	4.6
Memory
Maximum RAM amount	1 GB	2 GB
Memory bandwidth	14.4 GB / s	28.51 GB / s
Memory bus width	64 Bit	128 Bit
Memory clock speed	1800 MHz	1782 MHz
Memory type	DDR3	DDR3