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Differences What are the advantages of each

Front view of Radeon HD 4870

Reasons to consider the
ATi Radeon HD 4870

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Higher memory bandwidth 115.2 GB/s vs 98.5 GB/s More than 15% higher memory bandwidth
Slightly better floating-point performance 1,200 GFLOPS vs 691.2 GFLOPS Around 75% better floating-point performance
More shading units 800 vs 192 608 more shading units
Wider memory bus 256 bit vs 192 bit Around 35% wider memory bus
Front view of GeForce GTX 550 Ti

Reasons to consider the
Nvidia GeForce GTX 550 Ti

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Higher clock speed 900 MHz vs 750 MHz 20% higher clock speed
Significantly better sky diver factor score 136.02 vs 2.24 Around 60.8x better sky diver factor score
Higher effective memory clock speed 4,104 MHz vs 3,600 MHz Around 15% higher effective memory clock speed
More render output processors 24 vs 16 8 more render output processors
Higher memory clock speed 1,026 MHz vs 900 MHz Around 15% higher memory clock speed
Lower TDP 116W vs 150W Around 25% lower TDP

Benchmarks Real world tests of Radeon HD 4870 vs GeForce GTX 550 Ti

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

3DMark Vantage (Texture Fill) Industry standard benchmark that tests DirectX performance

T-Rex (GFXBench 3.0) Data courtesy CompuBench

Sky Diver Factor Data courtesy FutureMark

Cloud Gate Factor Data courtesy FutureMark

Crysis: Warhead (2012) 1920x1200 - Frost Bench - Enthusiast Quality + 4xAA

SmallLux GPU 2.0d4 Measures compute performance using OpenCL to do 3D rendering

Reviews Word on the street

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