Radeon HD 5870 Mac vs GeForce GT 120 Mac

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ATi Radeon HD 5870 Mac

Nvidia GeForce GT 120 Mac

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Reasons to consider the
ATi Radeon HD 5870 Mac

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Much higher effective memory clock speed

4,780 MHz

1,600 MHz

Around 3x higher effective memory clock speed

Much higher memory bandwidth

153 GB/s

25.6 GB/s

Around 6x higher memory bandwidth

Higher clock speed

850 MHz

550 MHz

Around 55% higher clock speed

Significantly better floating-point performance

2,720 GFLOPS

89.6 GFLOPS

More than 30.2x better floating-point performance

Many more shading units

1,600

1568 more shading units

Higher texture rate

68 GTexel/s

8.8 GTexel/s

Around 7.8x higher texture rate

Higher pixel rate

27.2 GPixel/s

4.4 GPixel/s

Around 6.2x higher pixel rate

Significantly more texture mapping units

64 more texture mapping units

Significantly more render output processors

24 more render output processors

Significantly higher memory clock speed

1,195 MHz

800 MHz

Around 50% higher memory clock speed

Wider memory bus

256 bit

128 bit

2x wider memory bus

Reasons to consider the
Nvidia GeForce GT 120 Mac

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Much lower TDP

50W

228W

4.6x lower TDP

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 5870 Mac

153 GB/s

GeForce GT 120 Mac

25.6 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 5870 Mac

27.2 GPixel/s

GeForce GT 120 Mac

4.4 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 5870 Mac

68 GTexel/s

GeForce GT 120 Mac

8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5870 Mac

2,720 GFLOPS

GeForce GT 120 Mac

89.6 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

Radeon HD 5870 Mac

1,600

GeForce GT 120 Mac

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

Radeon HD 5870 Mac

GeForce GT 120 Mac

gpu	Radeon HD 5870 Mac	GeForce GT 120 Mac
GPU brand	ATI	Nvidia
GPU name	Cypress	G96 C1
Market	Desktop	Desktop
Clock speed	850 MHz	550 MHz
Is dual GPU	No	No
Reference card	None	None
raw performance
Shading units	1,600	32
Texture mapping units	80	16
Render output processors	32	8
Pixel rate	27.2 GPixel/s	4.4 GPixel/s
Texture rate	68 GTexel/s	8.8 GTexel/s
Floating-point performance	2,720 GFLOPS	89.6 GFLOPS

memory	Radeon HD 5870 Mac	GeForce GT 120 Mac
Memory clock speed	1,195 MHz	800 MHz
Effective memory clock speed	4,780 MHz	1,600 MHz
Memory bus	256 bit	128 bit
Memory	1,024 MB	512 MB
Memory type	GDDR5	GDDR3
Memory bandwidth	153 GB/s	25.6 GB/s
noise and power
TDP	228W	50W