NVIDIA GeForce GT 645M vs ATI Radeon HD 3870 X2

Comparative analysis of NVIDIA GeForce GT 645M and ATI Radeon HD 3870 X2 videocards for all known characteristics in the following categories: Essentials, Technical info, Video outputs and ports, Compatibility, dimensions and requirements, API support, Memory, Technologies. 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 645M

ATI Radeon HD 3870 X2

Differences

Reasons to consider the NVIDIA GeForce GT 645M

Videocard is newer: launch date 4 year(s) 8 month(s) later
A newer manufacturing process allows for a more powerful, yet cooler running videocard: 28 nm vs 55 nm
5.2x lower typical power consumption: 32 Watt vs 165 Watt
2x more maximum memory size: 2 GB vs 2x 512 MB
Around 59% better performance in PassMark - G3D Mark: 936 vs 587
Around 40% better performance in PassMark - G2D Mark: 164 vs 117

Specifications (specs)
Launch date	1 October 2012 vs 26 January 2008
Manufacturing process technology	28 nm vs 55 nm
Thermal Design Power (TDP)	32 Watt vs 165 Watt
Maximum memory size	2 GB vs 2x 512 MB
Benchmarks
PassMark - G3D Mark	936 vs 587
PassMark - G2D Mark	164 vs 117
GFXBench 4.0 - T-Rex (Frames)	3341 vs 3336
GFXBench 4.0 - T-Rex (Fps)	3341 vs 3336

Reasons to consider the ATI Radeon HD 3870 X2

9.4x more texture fill rate: 2x 13.2 GTexel / s billion / sec vs 22.7 billion / sec
Around 67% higher pipelines: 2x 320 vs 384
Around 94% better floating-point performance: 2x 528.0 gflops vs 544.5 gflops

Texture fill rate	2x 13.2 GTexel / s billion / sec vs 22.7 billion / sec
Pipelines	2x 320 vs 384
Floating-point performance	2x 528.0 gflops vs 544.5 gflops
Memory clock speed	1802 MHz vs 1800 MHz

Compare benchmarks

GPU 1: NVIDIA GeForce GT 645M
GPU 2: ATI Radeon HD 3870 X2

PassMark - G3D Mark

GPU 1

GPU 2

936

587

PassMark - G2D Mark

GPU 1

GPU 2

164

117

GFXBench 4.0 - T-Rex (Frames)

GPU 1

GPU 2

3341

3336

GFXBench 4.0 - T-Rex (Fps)

GPU 1

GPU 2

3341

3336

Name	NVIDIA GeForce GT 645M	ATI Radeon HD 3870 X2
PassMark - G3D Mark	936	587
PassMark - G2D Mark	164	117
Geekbench - OpenCL	2683
CompuBench 1.5 Desktop - Face Detection (mPixels/s)	8.493
CompuBench 1.5 Desktop - Ocean Surface Simulation (Frames/s)	285.42
CompuBench 1.5 Desktop - T-Rex (Frames/s)	0.863
CompuBench 1.5 Desktop - Video Composition (Frames/s)	17.242
CompuBench 1.5 Desktop - Bitcoin Mining (mHash/s)	19.116
GFXBench 4.0 - Car Chase Offscreen (Frames)	1913
GFXBench 4.0 - Manhattan (Frames)	3670
GFXBench 4.0 - T-Rex (Frames)	3341	3336
GFXBench 4.0 - Car Chase Offscreen (Fps)	1913
GFXBench 4.0 - Manhattan (Fps)	3670
GFXBench 4.0 - T-Rex (Fps)	3341	3336

Compare specifications (specs)

	NVIDIA GeForce GT 645M	ATI Radeon HD 3870 X2
Essentials
Architecture	Kepler	TeraScale
Code name	GK107	R680
Launch date	1 October 2012	26 January 2008
Place in performance rating	1187	1211
Type	Laptop	Desktop
Launch price (MSRP)		$449
Technical info
CUDA cores	384
Floating-point performance	544.5 gflops	2x 528.0 gflops
Manufacturing process technology	28 nm	55 nm
Pipelines	384	2x 320
Texture fill rate	22.7 billion / sec	2x 13.2 GTexel / s billion / sec
Thermal Design Power (TDP)	32 Watt	165 Watt
Transistor count	1,270 million	666 million
Core clock speed		825 MHz
Video outputs and ports
Display Connectors	No outputs	2x DVI, 1x S-Video
HDCP
HDMI
Maximum VGA resolution	Up to 2048x1536
Compatibility, dimensions and requirements
Bus support	PCI Express 2.0, PCI Express 3.0
Interface	PCIe 3.0 x16	PCIe 2.0 x16
Laptop size	medium sized
Length		267 mm
Supplementary power connectors		1x 6-pin + 1x 8-pin
API support
DirectX	12 API	10.1
OpenCL	1.1
OpenGL	4.5	3.3
Memory
Maximum RAM amount	2 GB	2x 512 MB
Memory bus width	128bit	2x 256 Bit
Memory clock speed	1800 MHz	1802 MHz
Memory type	DDR3\GDDR5	GDDR3
Shared memory	0
Memory bandwidth		2x 57.7 GB / s
Technologies
3D Blu-Ray
3D Vision
CUDA
DirectCompute
DirectX 11	DirectX 11
Optimus