AMD Radeon HD 7870M vs NVIDIA GeForce GT 645 OEM

Comparative analysis of AMD Radeon HD 7870M and NVIDIA GeForce GT 645 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, GFXBench 4.0 - Manhattan (Frames), GFXBench 4.0 - Manhattan (Fps), GFXBench 4.0 - T-Rex (Frames), GFXBench 4.0 - T-Rex (Fps).

AMD Radeon HD 7870M

NVIDIA GeForce GT 645 OEM

Differences

Reasons to consider the AMD Radeon HD 7870M

Around 3% higher core clock speed: 800 MHz vs 776 MHz
2.2x more pipelines: 640 vs 288
Around 15% better floating-point performance: 1,024 gflops vs 894.0 gflops
A newer manufacturing process allows for a more powerful, yet cooler running videocard: 28 nm vs 40 nm
2.3x lower typical power consumption: 45 Watt vs 102 Watt
2x more maximum memory size: 2 GB vs 1 GB
Around 4% higher memory clock speed: 4000 MHz vs 3828 MHz
Around 26% better performance in PassMark - G2D Mark: 556 vs 443
Around 75% better performance in GFXBench 4.0 - T-Rex (Frames): 3359 vs 1914
Around 75% better performance in GFXBench 4.0 - T-Rex (Fps): 3359 vs 1914

Specifications (specs)
Core clock speed	800 MHz vs 776 MHz
Pipelines	640 vs 288
Floating-point performance	1,024 gflops vs 894.0 gflops
Manufacturing process technology	28 nm vs 40 nm
Thermal Design Power (TDP)	45 Watt vs 102 Watt
Maximum memory size	2 GB vs 1 GB
Memory clock speed	4000 MHz vs 3828 MHz
Benchmarks
PassMark - G2D Mark	556 vs 443
GFXBench 4.0 - T-Rex (Frames)	3359 vs 1914
GFXBench 4.0 - T-Rex (Fps)	3359 vs 1914

Reasons to consider the NVIDIA GeForce GT 645 OEM

Around 16% higher texture fill rate: 37.2 GTexel / s vs 32 GTexel / s
Around 33% better performance in PassMark - G3D Mark: 2006 vs 1507

Specifications (specs)
Texture fill rate	37.2 GTexel / s vs 32 GTexel / s
Benchmarks
PassMark - G3D Mark	2006 vs 1507

Compare benchmarks

GPU 1: AMD Radeon HD 7870M
GPU 2: NVIDIA GeForce GT 645 OEM

PassMark - G3D Mark

GPU 1

GPU 2

1507

2006

PassMark - G2D Mark

GPU 1

GPU 2

556

443

GFXBench 4.0 - T-Rex (Frames)

GPU 1

GPU 2

3359

1914

GFXBench 4.0 - T-Rex (Fps)

GPU 1

GPU 2

3359

1914

Name	AMD Radeon HD 7870M	NVIDIA GeForce GT 645 OEM
PassMark - G3D Mark	1507	2006
PassMark - G2D Mark	556	443
GFXBench 4.0 - Manhattan (Frames)	1367
GFXBench 4.0 - Manhattan (Fps)	1367
GFXBench 4.0 - T-Rex (Frames)	3359	1914
GFXBench 4.0 - T-Rex (Fps)	3359	1914

Compare specifications (specs)

	AMD Radeon HD 7870M	NVIDIA GeForce GT 645 OEM
Essentials
Architecture	GCN 1.0	Fermi 2.0
Code name	Heathrow	GF114
Launch date	24 April 2012	24 April 2012
Place in performance rating	590	587
Type	Laptop	Desktop
Technical info
Core clock speed	800 MHz	776 MHz
Floating-point performance	1,024 gflops	894.0 gflops
Manufacturing process technology	28 nm	40 nm
Pipelines	640	288
Texture fill rate	32 GTexel / s	37.2 GTexel / s
Thermal Design Power (TDP)	45 Watt	102 Watt
Transistor count	1,500 million	1,950 million
Video outputs and ports
Display Connectors	No outputs	2x DVI, 1x mini-HDMI
Compatibility, dimensions and requirements
Interface	PCIe 3.0 x16	PCIe 2.0 x16
Laptop size	large
Length		210 mm
API support
DirectX	12.0 (11_1)	12.0 (11_0)
OpenGL	4.5	4.6
Memory
Maximum RAM amount	2 GB	1 GB
Memory bandwidth	64 GB / s	91.9 GB / s
Memory bus width	128 Bit	192 Bit
Memory clock speed	4000 MHz	3828 MHz
Memory type	GDDR5	GDDR5
Shared memory	0